For the righteousness of Christ alone imputed to us is the foundation and meritorious cause upon which our absolutary (absolving) sentence rests, so that for no other reason does God bestow the pardon of sin and the right to life than on account of the most perfect righteousness of Christ imputed to us and apprehended by faith. Hence it is readily gathered that we have not here a mere dispute about words (as some falsely imagine), but a controversy most real and indeed of the highest moment. In it we treat of the principal foundation of our salvation, which being overthrown or weakened, all our confidence and consolation both in life and in death must necessarily perish.
…The gospel teaches that what could not be found in us was to be sought in another, could be found nowhere else than in Christ, the God-man; who taking upon himself the office of surety most fully satisfied the justice of God by his perfect obedience and thus brought to us an everlasting righteousness by which alone we can be justified before God; in order that covered and clothed with that garment as though it were of our first-born (like Jacob), we may obtain under in the eternal blessing of our heavenly Father.
…The obedience of Christ rendered in our name to God the Father is so given to us by God that it is reckoned to be truly ours and that it is the sole and only righteousness on account of and by the merit of which we are absolved from the guilt of our sins and obtain a right to life….”
Francis Turretin, Institutes, vol 2, p. 639, 647, 648.