18 "A good tree cannot bear bad fruit; neither can a worthless tree bear good fruit.
Matthew 7:18 Cross References - MNT
Galatians 5:17
17 For the desire of the flesh is against that of the Spirit, and the desire of the Spirit is against that of the flesh, for they two are antagonistic, so that you may not do those things that you wish.
1 John 3:9-10
9 Whoever is a child of God cannot go on sinning, because his seed is abiding in him; and he cannot go on sinning because he is a child of God.
10 In this the children of God are manifest, and the children of the devil; for every one who does not work righteousness is not a child of God, nor is he who does not love his brother.