"There is no commonly honest man who does not more dread the inward disgrace of such an action, the indelible stain which it would for ever stamp upon his own mind, than the greatest external calamity which, without any fault of his own, could possibly befal him; and who does not inwardly feel the truth of that great stoical maxim, that for one man to deprive another unjustly of any thing, or unjustly to promote his own advantage by the loss or disadvantage of another, is more contrary to nature, than death, than poverty, than pain, than all the misfortunes which can affect him, either in his body, or in his external circumstances."
— Smith, Adam (1723-1790)
(text from from econlib.org, III.i.48; cf. p. 138 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>