"If faith is what you have to go on, if faith is the link between your beliefs and the world at large, your beliefs are very likely to be wrong. Beliefs can be right or wrong. If you believe you can fly, that belief is only true if indeed you can fly. Somebody who thinks he can fly, and is wrong about it, will eventually discover there's a problem with his view of the world."

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I believe in good and evil," said Jem. "And I believe the soul is eternal. But I don't believe in the fiery pit, the pitchforks, or endless torment. I do not believe you can threaten people into goodness." Tessa looked at will. "What about you? What do you believe? "Pulvis et umbra sumus," said Will, not looking at her as he spoke. "I believe we are dust and shadows. What else is there?

— Cassandra Clare