It is the will of God and nature [he wrote in his fifty-first year to Elizabeth Hubbard, after the death of his brother John] that these mortal bodies be laid aside, when the soul is to enter into real life. This is rather an embryo state, a preparation for living. A man is not completely born until he be dead. Why then should we grieve, that a new child is born among the immortals, a new member added to their happy society?
We are spirits. That bodies should be lent us, while they can afford us pleasure, assist us in acquiring knowledge, or in doing good to our fellow creatures, is a kind and benevolent act of God. When they become unfit for these purposes, and afford us pain instead of pleasure, instead of an aid become an incumbrance, and answer none of the intentions for which they were given, it is equally kind and benevolent, that a way is provided by which we may get rid of them. Death is that way. We ourselves, in some cases, prudently choose a partial death. A mangled painful limb, which cannot be restored, we willingly cut off. He who plucks out a tooth, parts with it freely, since the pain goes with it; and he, who quits the whole body, parts at once with all pains and possibilities of pains and diseases which it was liable to, or capable of making him suffer.
Our friend and we were invited abroad on a party of pleasure, which is to last forever. His chair was ready first, and he is gone before us. We could not all conveniently start together; and why should you and I be grieved at this, since we are soon to follow, and know where to find him? Adieu.
It was a sane, bright conception of human destiny indeed which could convert the grim ferryman of the Styx into little more than an obsequious chairman, waiting at the portals of life until it suited the convenience of his fare to issue from them.
That Being [he wrote to George Whitefield] who gave me Existence, and thro' almost three-score Years has been continually showering his Favours upon me, whose very Chastisements have been Blessings to me; can I doubt that he loves me? And, if he loves me, can I doubt that he will go on to take care of me, not only here but hereafter? This to some may seem Presumption; to me it appears the best grounded Hope; Hope of the Future, built on Experience of the Past.
The same thought is repeated in a letter to William Strahan, followed, however, by the dig which he rarely failed to give to his Tory friend, "Straney," when he had the chance:
God has been very good to you, from whence I think you may be assured that he loves you, and that he will take at least as good care of your future Happiness as he has done of your present. What Assurance of the Future can be better founded than that which is built on Experience of the Past? Thank me for giving you this Hint, by the Help of which you may die as chearfully as you live. If you had Christian Faith, quantum suff., this might not be necessary; but as matters are it may be of Use.
This hopeful outlook continued until the end. In a letter to his "dear old friend," George Whatley, which was written about five years before the writer's death, he adds a resource borrowed from his scientific knowledge to the other resources of his tranquil optimism.
You see [he said] I have some reason to wish, that, in a future State, I may not only be as well as I was, but a little better. And I hope it; for I, too, with your Poet, trust in God. And when I observe, that there is great Frugality, as well as Wisdom, in his Works, since he has been evidently sparing both of Labour and Materials; for by the various wonderful Inventions of Propagation, he has provided for the continual peopling his World with Plants and Animals, without being at the Trouble of repeated new Creations; and by the natural Reduction of compound Substances to their original Elements, capable of being employ'd in new Compositions, he has prevented the Necessity of creating new Matter; so that the Earth, Water, Air, and perhaps Fire, which being compounded form Wood, do, when the Wood is dissolved, return, and again become Air, Earth, Fire, and Water; I say that, when I see nothing annihilated, and not even a Drop of Water wasted, I cannot suspect the Annihilation of Souls, or believe, that he will suffer the daily Waste of Millions of Minds ready made that now exist, and put himself to the continual Trouble of making new ones. Thus finding myself to exist in the World, I believe I shall, in some Shape or other, always exist.