Jonathan Edwards on Sola Fide

A person is to be justified, when he is approved of God as free from the guilt of sin and its deserved punishment, and as having that righteousness belonging to him that entitles to the reward of life. That we should take the word in such a sense, and understand it as the judge’s accepting a person as having both a negative and positive righteousness belonging to him, and looking on him therefore as not only free from any obligation to punishment, but also as just and righteous and so entitled to a positive reward, is not only most agreeable to the etymology and natural import of the word, which signifies to pass one for righteous in judgment, but also manifestly agreeable to the force of the word as used in Scripture. … But certainly, in order to a person’s being looked on as standing right with respect to the rule in general, or in a state corresponding with the law of God, more is needful than not having the guilt of sin. For whatever that law is, whether a new or an old one, doubtless something positive is needed in order to its being answered. We are no more justified by the voice of the law, or of him that judges according to it, by a mere pardon of sin, than Adam, our first surety, was justified by the law, at the first point of his existence, before he had fulfilled the obedience of the law, or had so much as any trial whether he would fulfill it or no. If Adam had finished his course of perfect obedience, he would have been justified, and certainly his justification would have implied something more than what is merely negative. He would have been approved of, as having fulfilled the righteousness of the law, and accordingly would have been adjudged to the reward of it. So Christ, our second surety (in whose justification all whose surety he is, are virtually justified), was not justified till he had done the work the Father had appointed him, and kept the Father’s commandments through all trials, and then in his resurrection he was justified. When he had been put to death in the flesh, but quickened by the Spirit, 1 Pet. 3:18, then he that was manifest in the flesh was justified in the Spirit, 1 Tim. 3:16. –Jonathan Edwards, Justification by Faith Alone