From Boswell's The Life of Johnson

"""""I mentioned to Dr. Johnson, that David Hume's persisting in his infidelity, when he was dying, shocked me much. JOHNSON. "Why should it shock you, Sir? Hume owned he had never read the New Testament with attention. Here then was a man who had been at no pains to enquire into the truth of religion, and had continually turned his mind the other way. It was not to be expected that the prospect of death would alter his way of thinking, unless GOD should send an angel to set him right." I said, I had reason to believe that the thought of annihilation gave Hume no pain. JOHNSON. "It was not so, Sir. He had a vanity in being thought easy. It is more probable that he should assume an appearance of ease, than so very improbable a thing should be, as a man not afraid of going (as, in spite of his delusive theory, he cannot be sure but he may go), into an unknown state, and not being uneasy at leaving all he knew. And you are to consider, that upon his own principle of annihilation he had no motive to speak the truth." The horrour of death, which I had always observed in Dr. Johnson, appeared strong to-night. I ventured to tell him, that I had been, for moments in my life, not afraid of death; therefore I could suppose another man in that state of mind for a considerable space of time. He said, "he never had a moment in which death was not terrible to him." He added, that it had been observed, that scarce any man dies in publick, but with apparent resolution from that desire of praise which never quits us. I said, Dr. Dodd seemed to be willing to die, and full of hopes of happiness. "Sir, (said he,) Dr. Dodd would have given both his hands and both his legs to have lived. The better a man is, the more afraid is he of death, having a clearer view of infinite purity." He owned, that our being in an unhappy uncertainty as to our salvation, was mysterious; and said, "Ah! we must wait till we are in another state of being, to have many things explained to us." Even the powerful mind of Johnson seemed foiled by futurity. But I thought, that the gloom of uncertainty in solemn religious speculation, being mingled with hope, was yet more consolatory than the emptiness of infidelity. A man can live in thick air, but perishes in an exhausted receiver.""""""

Which is to say, the real test of faith--or ~(faith)--starts on one's deathbed.