”This is a picture of the road to Christ Jesus. It is no
roundabout road of the law; it is no obeying this, that, and the other; it is a
straight road: "Believe, and live." It is a road so hard, that no
self-righteous man can ever tread it, but so easy, that every sinner, who knows
himself to be a sinner may by it find his way to heaven.”

-- Charles Spurgeon

"Therefore the afflicted conscience has no remedy against despair and eternal death except to take hold of the promise of grace offered in Christ, that is, this righteousness of faith, this passive or Christian righteousness, which says with confidence: “I do not seek active righteousness. I ought to have and perform it; but I declare that even if I did have it and perform it, I cannot trust in it or stand up before the judgment of God on the basis of it. Thus I put myself beyond all active righteousness, all righteousness of my own or of the divine Law, and I embrace only that passive righteousness which is the righteousness of grace, mercy, and the forgiveness of sins.” In other words, this is the righteousness of Christ and of the Holy Spirit, which we do not perform but receive, which we do not have but accept, when God the Father grants it to us through Jesus Christ.

"As the earth itself does not produce rain and is unable to acquire it by its own strength, worship, and power but receives it only by a heavenly gift from above, so this heavenly righteousness is given to us by God without our work or merit. As much as the dry earth of itself is able to accomplish in obtaining the right and blessed rain, that much can we men accomplish by our own strength and works to obtain that divine, heavenly, and eternal righteousness. Thus we can obtain it only through the free imputation and indescribable gift of God."

-- Martin Luther, Lectures on Galatians