This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...e has no sensory evidence or rational proof.

When a man rejects reason as his standard of judgment, only one alternative standard remains to him: his feelings. A mystic is a man wh
o treats his feelings as tools of cognition. Faith is the equation of feeling with knowledge.

To practice the “virtue” of faith, one must be willing to suspend one’s sight an
d one’s judgment; one must be willing to live with the unintelligible, with that which cannot be conceptualized or integrated into the rest of one’s knowledge, and to induce a trancelike ill...
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