God has willed to redeem men and to open salvation to those who seek it. But men render themselves so unworthy of it that it is right that God should refuse to some, because of their obduracy, what He grants others from a compassion which is not due to them. If He had willed to overcome the obstinacy of the most hardened, He could have done so by revealing Himself so manifestly to them that they could not have doubted of the truth of His essence; as it will appear at the last day, with such thunders and such a convulsion of nature that the dead will rise again, and the blindest will see Him.” It is not in this manner that He has willed to appear in His advent of mercy, because, as so many make themselves unworthy of His mercy, He has willed to leave them in the loss of the good which they do not want.
It was not, then, right that He should appear in a manner manifestly divine, and completely capable of convincing all men; but it was also not right that He should come in so hidden a manner that He could not be known by those who should sincerely seek Him.
He has willed to make himself quite recognizable by those; and thus, willing to appear openly to those who seek Him with all their heart, and to be hidden from those who flee from Him with all their heart. He so regulates the knowledge of Himself that He has given signs of Himself, visible to those who seek Him, and not to those who seek Him not. There is enough light for those who only desire to see, and enough obscurity for those who have a contrary disposition.
— Blaise Pascal, from Pensées (430)