Selection from Arcana Coelestia ~ Emanuel Swedenborg
They suppose they do what is good and think what is true from themselves; and because they are as yet in great obscurity, the Lord also leaves them so to imagine. But still all the good they do and all the truth they think while in such imagination, is not the good and truth of faith. For whatever man produces of himself cannot be good, because it is from himself, that is, from a fountain which is impure and most unclean. From this impure and unclean fountain no good can ever go forth, for the man is always thinking of his own merit and righteousness; and some go so far as to despise others in comparison with themselves -And he spake this parable unto certain which trusted in themselves that they were righteous, and despised others: Two men went up into the temple to pray; the one a Pharisee, and the other a publican. The Pharisee stood and prayed thus with himself, God, I thank thee, that I am not as other men are, extortioners, unjust, adulterers, or even as this publican. I fast twice in the week, I give tithes of all that I possess. And the publican, standing afar off, would not lift up so much as his eyes unto heaven, but smote upon his breast, saying, God be merciful to me a sinner. I tell you, this man went down to his house justified rather than the other: for every one that exalteth himself shall be abased; and he that humbleth himself shall be exalted. (Luke 18:9-14)and others err in other ways.
Man's own cupidities intermingle themselves, so that while it appears outwardly to be good, it is inwardly filthy. For this reason the good which man does in this state is not the good of faith, and the case is the same with the truth that he thinks, for although that which he thinks may be very true, yet so long as it is from what is his own it is indeed in itself the truth of faith, but the good of faith is not in it; and all truth, in order to be the truth of faith, must have in it from the Lord the good of faith. Then for the first time there are good and truth.
(from Arcana Coelestia 874)