This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
... place to draw the line, no principle by which to draw it, no barrier faith cannot cross, no part of one’s life faith cannot invade: one remains rational until and unless one’s feelings decr ee otherwise.

Faith is a malignancy that no system can tolerate with impunity; and the man who succumbs to it, will call on it in precisely those issues where he needs his reason m
ost. When one turns from reason to faith, when one rejects the absolutism of reality, one undercuts the absolutism of one’s consciousness — and one’s mind becomes an organ one can not trus...
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