The way of man is froward and strange: but as for the pure, his work is right.
– Proverbs 21:8
The word for froward means crooked, or perverse. The word for strange means guilty. The first phrase means the guilty man goes in a crooked way. The same idea is expressed of the evil man in Proverbs 2:15. The word for pure means clean, or righteous. The word for right means straight, or upright. The contrast is obvious. The guilty walk a crooked way while the innocent walk a straight path. The purpose of the proverb is to teach wisdom and discernment. Wisdom here teaches a tree is known by its fruits.