We tend to think of "fruit" in two ways in natural language. One is as food that grows on trees and vines, sweet and delicious, and able to be eaten without harming the plant in any way. Another is as the things we produce, what our work yields for the betterment of the world. These are obviously connected: we are like trees, producing things that "feed" the world in some way, just as the tree produces fruit that feeds us. It makes sense, then, that the idea of fruit in the Bible is bound closely to the idea of goodness. Fruits that are eaten represent the desire for good and the energy to do what is good; fruit that is produced is the actual good that we go into the world and do.

9. The third state is one of repentance, a state in which he speaks piously and devoutly from the internal man and brings forth goods, like charitable acts which are nevertheless inanimate since he imagines that they originate in himself. They are called a tender plant, then a seed-bearing plant, and finally a fruit tree.