Your works reflect what you are. You can make the tree good or you can make it bad.
The preacher and the Christian witness need to point out the inconsistency that is in the world in the behaviour of those who are opposed to God. The world wants to put on an appearance of righteousness, but there is so much hypocrisy in it. It is the work of the evangelist to strip this bear and to ‘[cast] down imaginations, and every high thing that exalteth itself against the knowledge of God (2 Corinthians 10:5).
Some think this refers to Christ and he speaks of himself. It would then be a saying about how the Pharisees regard him – ‘make’ in the sense of consider. Either consider me to be good, or consider me to be evil, but then you must account for the miracles and the words of life that come from me, which you will never be able to do. But he does not go on to apply it to himself, and the more natural way to read it is as words addressed to the Pharisees.