This is a bill to foreclose a mortgage given in January, 183Í, by the defendant to one Samuel Adair, who was the father of these parties, and by the said Samuel assigned to this complainant in the month of May following. The mortgage purports to have been given to secure the payment of the sum of $650, in semi-annual. installments of $50 each, with interest, and contains a covenant for the payment *209thereof accordingly. To defeat this action the defendant insists in his answer, 1st, That the mortgage was not, in fact, given to secure the payment of $650, or of any sum of money, but as security for the execution of a certain parol agreement for the payment of certain debts outstanding against the said Samuel, and for aid in supporting him and his wife; 2d, That the assignment was without consideration, and fi’audulent and void; and that it was never delivered to the said complainant by said Samuel; and, 3d, Set-off, to a large amount, which he claims should be applied in payment of the sum secured to be paid by said mortgage.
The execution and delivery of the mortgage are admitted; and we therefore proceed to the consideration of the defense.
The first proposition of the defendant is wholly unsustained by the evidence. The only testimony which is claimed, by the defendant’s counsel, to bear directly on this point, is that of Laura Lockwood; but there is nothing in this, nor in the relation of the parties, or surrounding circumstances, which justifies the conclusion that the expressed contract of the mortgagor and mortgagee was not their real contract.
But, without wasting words on this subject, however strong the evidence might be, this defense would be of no avail. To hold that a party may reply to an action upon a written instrument, — “It is true I made the contract, but it was not my agreement, and I did not intend to be bound by it” — would set the law of contracts all afloat, render the certainty of the law a fiction, and place the obligations of parties beyond judicial control. It is true that, if there be fraud or mistake in the contract, equity will relieve, to annul or correct it, as the case may be: but it exercises this jurisdiction in cases of fraud upon grounds of public policy, as well as to relieve an injured party from injustice through the designs of another; and in those of mistake, upon the ground that the instrument is not made to speak the real intent of the parties. In both instances, however, clear and unequivocal proof is required to authorize the interference of the Court.
*210But where the parties have deliberately and understandingly executed an instrument — where one has not been defrauded, or both mistaken — they can not afterwards be permitted, in any court, to insist that it does not express their real intentions, but that quite another thing- was designed. The true rule is: Where parties have deliberately put then-engagements into writing, in such terms as import a legal obligation, without any uncertainty as to the object or extent of such engagement, it is conclusively presumed that their whole engagement, and the extent and manner of their undertaking, were reduced to writing; and no evidence is permitted tending to vary or contradict its terms, or to substitute a new or different contract for it. — 1 Greenl. Ev. § 275. Thus it was held in Sutherland vs. Crane, Walk. Ch. 523, that parol evidence can not be received,, to add to, or vary, the terms of a written instrument. “It may” (said the Chancellor) “be introduced for the purpose of showing fraud or mistake in drawing the instrument, when the fraud or mistake is set forth in the bill, and the relief asked is based upon it; but not otherwise.” This rule is forcibly illustrated by Mr. Spence in 1 Eq. Juris. 556. “It,” he says, “ excludes from the consideration of the Court every question but this — What is the meaning of the words which the parties used? The question is not broadly, What was the intention of the parties — what the meaning of the words indicate must be taken to have been the intention.” And this rule is based upon sound policy, and is, with perhaps a single and doubtful exception, of universal application; and is the only one which can be safely followed, without destruction of a fundamental law of contracts underlying the entire business relations of society.
The second proposition of defendant’s answer is, That the assignment is without consideration; that it was never delivered by Samuel Adair to complainant; and that it is fraudulent and void.
This proposition, like the first, might be disposed of with *211'the single remark that it is entirely unsustained by the proof. The defendant, however, seeks to have the Court draw this inference from the relations of the parties, and the form of the assignment. It is true that Samuel Adair was the father of both the complainant and the defendant; but this relation is not inconsistent with the presumption, much less the ascertained and acknowledged fact, that the one was his debtor, nor that the other might be the purchaser of his securities, or the object of his gratuitous bounty. Whether the assignment was for or without a consideration, is no matter of concern to this defendant, except for the single purpose of enabling him to make available his claim of set-off and payment; which we will presently consider. Its form furnishes no sufficient ground for the presumption that it was never delivered. No witnesses are necessary to render an assignment valid, nor is an acknowledgment and registry necessary; nor would a registry be constructive notice; — indeed, as a general rule, the transfer of the debt, or obligation, with the evidence of it, will operate to assign all collateral securities, without any instrument of writing whatever.
The assignment being then sufficient in this case to transfer the obligation and the security, and it being found in the possession of the complainant, no presumption can be raised against his title. The burthen of impeaching it was upon the defendant, and he has offered no proof relative thereto. Indeed, we are constrained from a consideration of all the proofs in the case; from the situation and the relations of the parties; from the facts shadowed forth in the evidence, if not fully established — that the father had transferred all his property, real and personal, to the defendant, and was about moving to a distant part of the State, and the defendant was to accompany him — to conclude that the assignment was made for the purpose of distribution of his property, if upon no valuable consideration; and that the defendant must have known it. The connection of the defendant with his father was of so intimate a character, that it forbids the pre*212sumption that any knowledge of their affairs was withheld, from him; while there is nothing to show but that the parties were upon the most intimate and fraternal relations. And it is altogether inconsistent with these relations to presume ignorance on the part of the defendant of a fact so intimately concerning himself; or that the knowledge of it was suppressed by the complainant. But this is immaterial under the view we take of this case.
It is also claimed by the defendant that the period of time that has elapsed since the execution of the mortgage, taken in connection with the proofs, is sufficient to raise the presumption that it has been actually paid. It is suggested, also, that it raises the presumption that it was executed under a family arrangement; but we will consume no time upon this question, as such a presumption would avail nothing to the defendant, and could only serve to raise another presumption, viz., of knowledge on the part of defendant of everything connected with it.
But as to the presumption of payment, the whole defense is based upon the proposition that the mortgage does not express the real intention of the parties, and that the real contract has been fully executed. This is all that the defendant can mean by his claim of set-off and payment. Denying to him the right to insist upon his first proposition, his whole defense falls to the ground. Yet, assuming that he may still avail himself of the claim of payment, and establish it either by presumptions or proofs, the presumption of payment claimed to arise from “ staleness of the demand ” can hardly, upon any principle of equity or law, arise in this case. This species of presumption is one which courts will sometimes raise — in the absence of all direct evidence upon which their judgment is evoked — from lapse of time and surrounding circumstances. It is true that time has always been regarded as an auxiliary to other facts and circumstances in questions of payment; possessing more or less importance as the period may have been longer or shorter: but this presumption can *213never arise, from lapse of time alone, short of the period fixed by law.— 9 Yer. 424; 12 Pa. S. R. 312; Abbott vs. Godfrey's Heirs, 1 Mich. 178. In the present ease, the defendant affirmatively insists upon payment, by way of set-off and otherwise (and we are aware of no rule allowing presumptions of this kind in support of a claim of set-off); and supports his claim by evidence bearing directly upon the question. These facts and this presumption can not exist together; for the whole theory of presumptions arising from the staleness of the claim, is based upon the absence of proof bearing, in the one or the other way, directly upon the subject. In this respect, this presumption is entirely different from that arising' under the statute of limitations; as after that statute has run, the presumption becomes one of law; and is conclusive in courts of law, and generally in equity, notwithstanding the most positive proof of non-payment.
The remaining claim of the defendant is, that he has paid large amounts for Samuel Adair, which more than cover that claimed to be due, and that the same should be applied in discharge of this mortgage. We do not think this claim can avail anything to the defendant. By far the largest amount claimed to be due from the mortgagor to him, accrued (if at all) before the execution and delivery of the mortgage; and the residue after the assignment, and a portion of that after the mortgagee’s death. Now, giving full credit to the testimony of all the defendant’s witnesses, it is yet impossible, upon any reasonable hypothesis, to conclude that the defendant would execute his covenant and mortgage for this sum of §650 and interest, payable in installments running through some seven years, before full payment, if, as is claimed, he had then worked for”the mortgagee more than a year and a half, and was then laboring for him upon a contract for two years’ labor at §300 per year. Men do not do business in that way; and there is no reason shown in this case why this defendant should stultify himself by making so absurd a contract. The uncertainty as to time and circumstance, and *214the doubt which overhangs this portion of defendant’s case,, forbids the allowance of this claim; and the evidence is of no value except in so far as it tends to show a probable reason why the defendant should have performed the services, and discharged the liabilities, which he claims he has, and. yet leave this covenant and mortgage valid and subsisting, in the hands of his father or this complainant; and further, to raise the not unreasonable presumption, that he knew it was intended by the mortgagee to pass to the complainant, for his share of the father’s property, which he thus chose to distribute in his lifetime. It also tends to illustrate the payment, after Samuel Adair’s decease, by the defendant, of his debts (for the latter had acquired all his property, both real and personal), and to repel the presumption that he has any equitable claim against the complainant, or would have against Ms father’s estate, for re-payment thereof.
These reasons, and the general doubt; and uncertainty which 'overhang the testimony of the witnesses, compel us also to reject the claim of payments, shown to have been made by the defendant after the assignment, as well as after the death of the mortgagee.
After a careful examination of the whole case, we can not discover either equity or probability in the defense; and the. decree of the Court below must therefore be reversed, and one entered in favdr of the complainant, with costs of this, Court and of the Court below.
The other Justices concurred.The following order was entered in the cause:
. “The cause having been brought to this Court by ap-. peal from the Circuit Court for the county of Macomb,, and the same having been argued and submitted to the Court: It is ordered, adjudged, and decreed, That the decree of the Court below be reversed, and altogether held for naught.. And it is further ordered, adjudged, and decreed, That the. *215complainant is entitled to have and receive of the defendant the whole amount secured to be paid by the mortgage mentioned in the bill of complaint in this cause, with interest thereon, and that this cause be remitted to the Court below, for further proceedings according to the rules and practice of said Court. And it is further ordered, That the said complainant recover his costs in this Court to be taxed, and that he have execution therefor.”