To Prevent Any Man From Pretending Ignorance

That there exists in the human mind, and indeed by natural instinct, some sense of Deity, we hold to be beyond dispute, since God Himself, to prevent any man from pretending ignorance, has endued all men with some idea of His Godhead, the memory of which He constantly renews and occasionally enlarges, that all to a man, being aware that there is a God, and that He is their Maker, may be condemned by their own conscience when they neither worship Him nor consecrate their lives to His service. (John Calvin, Institutes, Book 1, Chapter III)