So what is the vine or tree that produces agape love?
Jesus claims to be the True Vine, but we qualify as proper branches who can "bear much fruit' only if Jesus "prunes" us (John 15:1-2). Pruning involves an inner "cleansing" process (15:3), but what that cleansing means remains unclear. So we seek clarification from Paul:
"The fruit (singular) of the Spirit is agape love: joy, peace, patience, kindness, generosity, faithfulness, gentleness, and self-control (Galatians 5:22-23)."
Here 2 crucial points must be noted:
(1) The fruit of agape love is a manifestation of the Holy Spirit, not of our mechanical obedience or human efforts.
(2) " Paul clarifies the mystical meaning of this in 5:24: "If we live in the Spirit, let us also
be led by the Spirit."
But then Paul makes it clear that we won't be "led by the Spirit" if we are ego-invested in comparative spiritualities (see 5:25).
That warning helps clarify the nature of the "pruning" and inner 'cleansing" that Jesus has in mind in His True Vine discourse.
My recent example of being "led by the Spirit" was a powerful prompting to walk towards an intersection after dark, where I encountered Clint who desperately needed a sympathetic ear because he had just found his son on the kitchen floor, dead of a drug overdose, and some kind soul had told him his son "had it coming." I lament that I don't have such mystical tender experiences more regularly.