"What is justification? We read much of it in our Bible, and the doctrine of it is reckoned one of the fundamental points of the true Christian religion, and so indeed it is. This grand doctrine, the fountain of our peace, and comfort, and salvation, was wonderfully darkened in the Popish kingdom; and the first light of the reformation, that God was pleased to break up in our forefathers' days, was mainly about this great doctrine.
Justification is not barely the pardon of sin; it is indeed always inseparable from it, the pardon of sin is a fruit of it, or a part of it. Justification is God's acquitting a man, and freeing him from all attainder; it is God's taking off the attainder that the broken law of God lays upon every sinner. Who is he that shall condemn? It is God that justifies, Rom. 8:33.
Justification and condemnation are opposites; every one is under condemnation that is not justified; and every justified man is freed from condemnation. Justification is not sanctification; it is an old Popish error, sown in the heads of a great many Protestants to think that justification and sanctification are the same. Justification and sanctification are as far different as these two:—There is a man condemned for high treason against the king by the judge; and the same man is sick of a mortal disease and if he dies not by the hands of the hangman today, he may die of his disease tomorrow: it is the work of the physician to cure the disease, but it is an act of mercy from the king that must save him from the attainder.
Justification is the acquitting and repealing the law-sentence of condemnation; sanctification is the healing of the disease of sin, that will be our bane except Christ be our physician."
--From a sermon by Robert Traill (1642-1716) on Galatians 2:21