“ Men never do evil so completely and cheerfully as when they do it from religious conviction. ”
Source: Pensées
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Man suffers only because he takes seriously what the gods made for fun. 
When people are alone, they become spiritual. When in company, they become religious 
All men make mistakes, but a good man yields when he knows his course is wrong, and repairs the evil. The only crime is pride. 
The more powerful and original a mind, the more it will incline towards the religion of solitude. 
Religion is excellent stuff for keeping common people quiet. Religion is what keeps the poor from murdering the rich.