Hume afterwards wrote the following letter on the same subject:—
"January 7, 1762.
"Dear Sir,—It has so seldom happened that controversies in philosophy, much more in theology, have been carried on without producing a personal quarrel between the parties, that I must regard my present situation as somewhat extraordinary, who have reason to give you thanks for the civil and obliging manner in which you have conducted the dispute against me, on so interesting a subject as that of miracles. Any little symptoms of vehemence, of which I formerly used the freedom to complain, when you favoured me with a sight of the manuscript, are either removed or explained away, or atoned for by civilities, which are far beyond what I have any title to pretend to. It will be natural for you to imagine, that I will fall upon some shift to evade the force of your arguments, and to retain my former opinion in the point controverted between us; but it is impossible for me not to see the ingenuity of your performance, and the great learning which you have displayed against me.
"I consider myself as very much honoured in being thought worthy of an answer by a person of so much merit; and as I find that the public does you justice with regard to the ingenuity and good composition of your piece, I hope you will have no reason to repent engaging with an antagonist, whom, perhaps, in strictness, you might have ventured to neglect. I own to you, that I never felt so violent an inclination to defend myself as at present, when I am thus fairly challenged by you, and I think I could find something specious at least to urge in my defence; but as I had fixed a resolution, in the beginning of my life, always
to leave the public to judge between my adversaries and me, without making any reply, I must adhere inviolably to this resolution, otherwise my silence on any future occasion would be construed an inability to answer, and would be matter of triumph against me."[119:1]
He then, in the passage already cited,[119:2] describes the occasion on which the "Theory of Miracles" was suggested to him.
In answer to this, there is a letter by Campbell, in which he endeavours to rival his opponent in candour, politeness, and gentlemanlike feeling. The happy courtesy with which he apologizes for the occasionally irascible tone of his essay, shows that the retired northern divine possessed in no small degree the qualities that might have adorned a more showy station.
Dr. Campbell to Hume.
25th June, 1762.