"Misery and wretchedness can never enter the breast in which dwells complete self-satisfaction; and though it may be too much, perhaps, to say, with the Stoics, that, under such an accident as that above mentioned, the happiness of a wise man is in every respect equal to what it could have been under any other circumstances; yet it must be acknowledged, at least, that this complete enjoyment of his own self-applause, though it may not altogether extinguish, must certainly very much alleviate his sense of his own sufferings."
— Smith, Adam (1723-1790)
(text from from econlib.org, III.i.69; cf. pp. 147-8 in Liberty Fund ed.)
Text checked against The Theory of Moral Sentiments; or, an Essay Towards an Analysis of the Principles by Which Men Naturally Judge Concerning the Conduct and Character, First of Their Neighbours, and Afterwards of Themselves. To Which Is Added, A Dissertation on the Origin of Languages. by Adam Smith, LL. D. Fellow of the Royal Societies of London and Edinburgh; One of the Commissioners of His Majesty's Customs in Scotland; and Formerly Professor of Moral Philosophy in the University of Glasgow. The Sixth Edition, With Considerable Additions and Corrections. In two volumes. (London: Printed for A. Strahan; and A. Cadell in the Strand; and W. Creech, and J. Bell & Co. at Edinburgh, 1790). <Link to ESTC>