Survival in Solitary: Paul's insights: Inner consciousness v. isolation
If you control a man’s thinking, you do not have to worry about his action. When you determine what a man shall think, you do not have to concern yourself about what he will do. If you make a man feel that he is inferior, you do not have to compel him to accept an inferior status for he will seek it himself. If you make a man think that he is justly an outcast, you do not have to order him to the back door. He will go without being told; and if there is no back door, his very nature will demand one.