Romans 2:19-21

2:19 and if you are convinced that you yourself are a guide to the blind, a light to those who are in darkness, 2:20 an educator of the senseless, a teacher of little children, because you have in the law the essential features of knowledge and of the truth – 2:21 therefore you who teach someone else, do you not teach yourself? You who preach against stealing, do you steal?