Jesus told his disciples a parable, "Can a blind person guide a blind person? Will not both fall into a pit? No disciple is superior to the teacher; but when fully trained, every disciple will be like his teacher. Why do you notice the splinter in your brother's eye, but do not perceive the wooden beam in your own? How can you say to your brother, 'Brother, let me remove that splinter in your eye, 'when you do not even notice the wooden beam in your own eye? You hypocrite! Remove the wooden beam from your eye first; then you will see clearly to remove the splinter in your brother's eye.
"A good tree does not bear rotten fruit, nor does a rotten tree bear good fruit. For every tree is known by its own fruit. For people do not pick figs from thorn bushes, nor do they gather grapes from brambles. A good person out of the store of goodness in his heart produces good, but an evil person out of a store of evil produces evil; for from the fullness of the heart the mouth speaks."