The Apostle Paul

“For what can be known about God is plain to them, because God has shown it to them. For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse.”- Romans 1:19-20 (ESV Strong’s)

John Calvin

“There is within the human mind, and indeed by natural instinct, an awareness of divinity, This we take to be beyond controversy. To prevent anyone from taking refuge in the pretense of ignorance, God himself has implanted in all men a certain understanding of his divine majesty…Since, therefore, men one and all perceive that there is a God and that he is their maker, they are condemned by their own testimony because they have failed to honor him and to consecrate their lives to his will. – Institutes I, iii, 1, P.44

“Men of sound judgement will always be sure that a sense of divinity which can never be effaced is engraved upon men’s minds. Indeed, the perversity of the impious, who though they struggle furiously are unable to extricate themselves from the fear of God, is abundant testimony that this conviction, namely that there is some God, is naturally inborn in all, and is fixed deep within, as it were in the very marrow…From this we conclude that it is not a doctrine that must first be learned in school, but one of which each of us is master from his mother’s womb and which nature itself permits to one to forget, although many strive with every nerve to this end. – Institutes I, iii, 3, P.46

Alvin Plantinga

“…there is a kind of cognitive mechanism, what Calvin calls the sensus divinitatis or sense of divinity, which in a wide variety of circumstances produces in us beliefs about God. These circumstances, we might say, trigger the disposition to form beliefs in question; they form the occasion on which those beliefs arise. Under these circumstances, we develop or form theistic beliefs-or rather, these beliefs are formed in us; in the typical case we don’t consciously choose to have those beliefs. Instead, we find ourselves with them, just as we find ourselves with perceptual and memory beliefs. (You don’t and can’t simply decide to have this belief, thereby acquiring it.) These passages suggest that awareness of God is natural, widespread, and not easy to forget, ignore or destroy.” – Warranted Christian Belief, Oxford University Press, 2000, p. 170-171