"Whenever conscience speaks with a divided, uncertain, and disputed voice, it is not the voice of God. Descend still deeper into yourself, until you hear nothing but a clear, undivided voice, a voice which does away with doubt and brings with it persuasion, light, and serenity."

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The great writers to whom the world owes what religious liberty it possesses, have mostly asserted freedom of conscience as an indefeasible right, and denied absolutely that a human being is accountable to others for his religious belief. Yet so natural to mankind is intolerance in whatever they really care about, that religious freedom has hardly anywhere been practically realised, except where religious indifference, which dislikes to have its peace disturbed by theological quarrels, has added its weight to the scale.

— John Stuart Mill