This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
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There is no greater self-delusion than to imagine that one can render unto reason that which is reason’s and unto faith that which is faith’s. Faith cannot be circumscribed
or delimited; to surrender one’s consciousness by an inch, is to surrender one’s consciousness in total. Either reason is an absolute to a mind or it is not — and if it is not, there is no
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...