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What objectivity and the study of philosophy requires is not an 'open mind,' but an active mind - a mind able and eagerly willing to examine ideas, but to examine them criticially.

Ayn Rand (1984). “Philosophy: Who Needs It”, p.28, Penguin
What objectivity and the study of philosophy requires is not an 'open mind,' but an active mind - a mind able and eagerly willing to examine ideas, but to examine them criticially.