married at Aberdeen to Miss Mary Dun, only daughter of the rector of the Grammar-school in that city; a mutual attachment having for some time existed between them. She was a few years younger than our author: her person was pleasing, her manners were lively; and she possessed a moderate share of accomplishments. This union, which seemed to promise nothing but happiness to Beattie, threw the blight of misery over his later years, and undoubtedly contributed to shorten his career. The woman whom he had selected as a partner for life, inherited from her mother the most dreadful of human maladies,—insanity; which, a few years after marriage, displayed itself in strange follies and caprices,[J] and at last broke forth with such violence, as to render her separation from her family absolutely neces[Pg xxiii]sary. By this lady he had two sons, of whom particular mention will be made hereafter.

[Pg xxiii]

Beattie now employed himself on the composition of his Essay on Truth, a work, which was to be honoured with such marks of public approbation, as the most sanguine author in his wildest dreams of success could hardly have anticipated. In a letter to Sir William Forbes, dated 17th January, 1768, he says:—

"I have, for a time, laid aside my favourite studies, that I might have leisure to prosecute a philosophical inquiry, less amusing indeed than poetry and criticism, but not less important. The extraordinary success of the sceptical philosophy has long filled me with regret. I wish I could undeceive mankind in regard to this matter. Perhaps this wish is vain: but it can do no harm to make the trial. The point I am now labouring to prove, is the universality and immutability of moral sentiment,—a point which has been brought into dispute, both by the friends and by the enemies of virtue. In an age less licentious in its principles, it would not, perhaps, be necessary to insist much on this point. At present it is very necessary. Philosophers have ascribed all religion to human policy. Nobody knows how soon they may ascribe all morality to the same origin; and then the foundations of human society, as well as of human happiness, will be effectually[Pg xxiv] undermined. To accomplish this end, Hobbes, Hume, Mandeville, and even Locke, have laboured; and, I am sorry to say, from my knowledge of mankind, that their labour has not been altogether in vain. Not that the works of these philosophers are generally read, or even understood by the few who read them. It is not the mode, now-a-days, for a man to think for himself; but they greedily adopt the conclusions, without any concern about the arguments or principles 

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