I think that's why you must, to the best of your ability, look at a person's heart. The outside of a person grows and changes in many ways throughout a person's life. But the heart better than anything else predicts where they are going.
I confess this is hard for me. I am often as hard on myself as anyone. I am burdened occasionally by what I do not yet know much less understand - I know there is plenty. But there is grace, grace for this moment, that God is not done with me yet.
___But the pot he was shaping from the clay was marred in his hands; so the potter formed it into another pot, shaping it as seemed best to him.