By Their Fruits
By their fruits = discern teachers and teaching by outcome - grapes from grapevines, thorns from thistles (Matthew 7:16-20).
Jesus pairs this with Judge Not: don't condemn souls, but do evaluate fruit. Wolves may wear sheep's clothing; time and results tell. Garden parallel: Signal vs Noise - what actually produces good over time? The Issues audit - does the teaching leave the graph healthier or broken?
Extends Judge Not. Contradicts Signal vs Noise when I can't tell fruit from hype.

