James 3:11-13 Doth a fountain send forth at the same place sweet water and bitter? Can the fig tree, my brethren, bear olive berries? either a vine, figs? so can no fountain both yield salt water and fresh.Who is a wise man and endued with knowledge among you? let him shew out of a good conversation his works with meekness of wisdom.
Matthew 12:33,35 Either make the tree good, and his fruit good; or else make the tree corrupt, and his fruit corrupt: for the tree is known by his fruit. A good man out of the good treasure of the heart bringeth forth good things: and an evil man out of the evil treasure bringeth forth evil things.
Matthew 7:20 Wherefore by their fruits ye shall know them.