43 For a good tree does not bear bad fruit, nor does a bad tree bear good fruit. 44 For every tree is known by its own fruit. For men do not gather figs from thorns, nor do they gather grapes from a bramble bush. 45 A good man out of the good treasure of his heart brings forth good; and an evil man out of the evil treasure of his heart brings forth evil. For out of the abundance of the heart his mouth speaks. (Luke 6:43–45, NKJV)
A good tree is free of defects that would cause it to produce bad fruit. Likewise, a good person has a treasure of good things in his or her heart that produce good things. Just as surely as a bad tree cannot bear good fruit, a heart with a treasure of bad (evil) things will not produce what is good. These are the words of Jesus, whose heart was only and always a treasure house of good things. He gives us a basis by which to know our hearts. Bad words out of the mouth shows bad (evil) things in your heart. If your words and actions are good in God’s sight, your good heart is being revealed. Test your words and actions today by what Jesus said. And, should you find bad things, then repent so your heart will have a treasure of good things from which to speak and act (Acts 17:30; 8:22).