We are blind to our own faults, do not see ourselves as others see us. There is One who tries not the “ways” only, but the “spirits” Hebrews 4:12 : this is the true remedy against self-deceit.
Related Commentaries of Proverbs 16:2
Proverbs 16:2
2 All the ways of a man are clean in his own eyes; but the LORD weigheth the spirits.