_In this respect_ faith _is contra-distinguished from_ science; _accordingly we are said to know a thing that is contained in an axiom, that no one, who has the exercise of his understanding, can doubt of_, viz. _that the whole is greater than the part; or, that a thing cannot be, and not be at the same time, &c. And every thing that is founded on a mathematical demonstration, is included in the word_ science; _to which we may add occular demonstration. Now these things are not properly the object of faith, or the assent we give to the truth hereof, is not founded barely upon evidence, in which respect faith is distinguished from it; for which reason we call it an assent to a truth, founded on evidence._ Footnote 61: Truth in the abstract is not the object of faith, but that which is true. The word of God when represented as the object of faith is not to be understood of words and letters, nor even of axioms and propositions, nor is the Divine veracity, though certainly confided in, the object of faith, or that which is assented unto. The promises which the old testament-believers had, and reposed in, were not the objects of faith, but the things which they saw afar off, and which were the ground of their rejoicing. When we are required to believe _on_ Jesus Christ, it is not his human, not his Divine nature, not his person, nor even his mediatorial character which is the object of our faith; for any of these alone could be no ground of confidence of salvation, or hope, much less produce joy in the believer. Every thing essential to our salvation must be considered, as the object of our faith; the mercy of God, the love of Christ, the purpose and the act of offering, and accepting the sacrifice to Justice of our sins, and the warrant to us to fix our hope and trust in this atonement; the firm conviction of the truth of these things may be denominated faith. Yet this conviction, or free assent of the understanding is not the faith, which accompanies salvation; if we can suppose it possible, that there should not be a corresponding impression made upon the will and affections. _With the heart man believeth unto salvation._ In this expression the heart is not put for the intellectual, but moral powers, and must not be understood as if the will assumed the office, peculiar to the understanding, of judging of evidence; but only that the assent of the understanding must be of such a kind, and to such a degree, as to produce a decisive co-operation of all the powers of the man, both of soul and body, to be saved in the way, and by the means discovered.