The greatest obstacle to the transformation of one’s own character is hypocrisy. If you always keep this in mind when dealing with a child, you can do him a lot of good. Of course, you must not sermonise or lecture him, etc. You should simply make him understand that there is a nobility in the being, a great purity, a great love of beauty, which is so powerful that even the most wicked and criminal people are forced to acknowledge a truly beautiful or heroic or selfless act. For, in human beings, there is a presence, the most marvellous Presence on earth, and except in a few very rare cases which I need not mention here, this presence lies asleep in the heart— not the physical heart but the psychic centre—of all beings. And when this Splendour is manifested with enough purity, it will awaken in all beings the echo of this Presence.
Ref: Words of The Mother – III