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, instead of being mortified, I shall be so vain as to pretend to a share of the praise; and shall think that my errors, by having at least some coherence, have led you to make a more strict review of my principles, which were the common ones, and lo perceive their futility.'

In his reply to this letter Reid recognises the debt which philosophy owes to the sceptical criticism of Hume. He writes thus to Hume:—

', 18th March 1763.

',—On Monday last Mr. John Farquhar brought me your letter of February 25th, enclosed in one from Dr. Blair. I thought myself very happy in having the means of obtaining, at second hand, through the friendship of Dr. Blair, your opinion of my performance; and you have been pleased to communicate it directly in so polite and friendly a manner as merits great acknowledgments on my part.

'In attempting to throw some light on these abstruse subjects, I wish to preserve the due mean between confidence and despair. But whether I have any success in this attempt or not, I shall always avow myself your disciple in metaphysics. I have learned more from your writings in this kind than from all others put together. Your system appears to me not only coherent in all its parts, but likewise justly deduced from principles commonly received among philosophers,—principles which I never thought of calling in question, until the conclusions you draw from them in the Treatise of Human Nature made me suspect them. If these principles are solid your system must stand; and whether they are or not can better be judged after you have brought to light the whole system that grows out of them, than when the greater part of it was wrapped up in clouds and darkness. I agree with you therefore, that if this system shall ever be demolished, you have a just claim to a great share of the praise, both because you have made it a distinct and determinate mark to be aimed at, and have furnished proper artillery for the purpose. When you have seen the whole of my performance, I shall take it as a very great favour to have your opinion upon it, from which I make no doubt of receiving light, whether I receive conviction or no.'