No good tree bears bad fruit, nor does a bad tree bear good fruit. Each tree is recognized by its own fruit. People do not pick figs from thorn bushes, or grapes from briers.
The good man brings good things out of the good stored up in his heart, and the evil man brings evil things out of the evil stored up in his heart. For out of the overflow of his heart his mouth speaks.
"Jesus says you are like a tree, and your words, actions, and decisions are the fruit that you produce. If your fruit is bad, it indicates a problem that needs to be addressed with the whole tree. You can't just fix the fruit. If there are bad apples on a tree, you can't correct the problem with paint or tape. You can't just water the apples. You need to check the roots, and check the tree for signs of disease.
Maybe part of your bad fruit is dishonesty. You cannot correct that by trying harder not to lie. That doesn't get to the heart of the problem, which is the heart. Your fruit will only change when you allow God to change your heart."