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"Mind is infinite and self-ruled, and is mixed with nothing, but is alone itself by itself." – Anaxagoras
"I need no warrant for being, and no word of sanction upon my being. I am the warrant and the sanction." – Ayn Rand, 'Anthem' (1937)
"This above all: to thine own self be true, And it must follow, as the night the day, Thou canst not then be false to any man." – William Shakespeare, 'Hamlet', act I, scene iii, lines 78–80