Adam Smith, the economist and philosopher, and David Hume, the philosopher and historian, were very close friends. In 1776, after Hume died, Smith wrote a letter describing his friend’s attitude toward his coming death. It is controversial whether Hume was an atheist, but it is clear that he maintained his skepticism regarding religion until the end.

Below are excerpts from Smith’s letter:

His cheerfulness was so great, and his conversation and amusements run so much in their usual strain, that, notwithstanding all bad symptoms, many people could not believe he was dying. “I shall tell your friend, Colonel Edmondstone,” said Doctor Dundas to him one day, “that I left you much better, and in a fair way of recovery.” “Doctor,” said he, “as I believe you would not choose to tell any thing but the truth, you had better tell him, that I am dying as fast as my enemies, if I have any, could wish, and as easily and cheerfully as my best friends could desire.”

When he was reading, a few days before, Lucian’s Dialogues of the Dead, among all the excuses which are alleged to Charon for not entering readily into his boat, he could not find one that fitted him; he had no house to finish, he had no daughter to provide for, he had no enemies upon whom he wished to revenge himself. “I could not well imagine”, said he, “what excuse I could make to Charon in order to obtain a little delay. I have done every thing of consequence which I ever meant to do; and I could at no time expect to leave my relations and friends in a better situation than that in which I am now likely to leave them. I therefore have all reason to die contented.”

He then diverted himself with inventing several jocular excuses, which he supposed he might make to Charon, and with imagining the very surly answers which it might suit the character of Charon to return to them. “Upon further consideration,” said he, “I thought I might say to him, Good Charon, I have been correcting my works for a new edition. Allow me a little time, that I may see how the public receives the alterations.” But Charon would answer, “When you have seen the effect of these, you will be for making other alterations. There will be no end of such excuses; so, honest friend, please step into the boat.”

But I might still urge, “Have a little patience, good Charon; I have been endeavoring to open the eyes of the public. If I live a few years longer, I may have the satisfaction of seeing the downfall of some of the prevailing systems of superstition.” But Charon would then lose all temper and decency. “You loitering rogue, that will not happen these many hundred years. Do you fancy I will grant you a lease for so long a term? Get into the boat this instant, you lazy loitering rogue.”

Thus died our most excellent and never to be forgotten friend; concerning whose philosophical opinions men will, no doubt, judge variously, every one approving or condemning them, according as they happen to coincide or disagree with his own; but concerning whose character and conduct there can scarce be a difference of opinion…. Upon the whole, I have always considered him, both in his lifetime and since his death, as approaching as nearly to the idea of a perfectly wise and virtuous man, as perhaps the nature of human frailty will permit.

I ever am, dear Sir, Most affectionately yours, Adam Smith

http://isites.harvard.edu/fs/docs/icb.topic880131.files/Adam.Smith.to.W.Strahan.Death.of.Hume.pdf