Scripture

1. Matthew 7:18 ^[1]

   A healthy tree cannot bear bad fruit, nor can a diseased tree bear good fruit. (ESV)
2. Luke 6:43–45 ^[1]

   A Tree and Its Fruit “For no good tree bears bad fruit, nor again does a bad tree bear good fruit, for each tree is known by its own fruit. For figs are not gathered from thornbushes, nor are grapes picked from a bramble bush. The good person out of the good treasure of his heart produces good, and the evil person out of his evil treasure produces evil, for out of the abundance of the heart his mouth speaks. (ESV)
3. John 15:5 ^[1]

   I am the vine; you are the branches. Whoever abides in me and I in him, he it is that bears much fruit, for apart from me you can do nothing. (ESV)