Luke 6:45

The (intrinsically) good man produces what is good and honorable and in his heart; and the (intrinsically) evil man produces what is wicked and depraved out of the evil (in his heart); for his mouth speaks from the overflow of his heart.

Both people are practicing what is placed in their heart. It is what they study and think on day in and day out. When we strive to produce good fruit, we must practice and meditate on the word to bear it. Be of good courage and keep the faith. Don’t let your heart be troubled because Jesus is there to guide us.