It is what is properly called vanity, and is the foundation of the most ridiculous and contemptible vices, the vices of affectation and common lying; follies which, if experience did not teach us how common they are, one should imagine the least spark of common sense would save us from.
 Adam Smith, The Theory of Moral Sentiments (1759). copy citation

add
Author Adam Smith
Source The Theory of Moral Sentiments
Topic vanity vice
Date 1759
Language English
Reference
Note
Weblink https://en.wikisource.org/wiki/The_Theory_of_Moral_Sentiments

Context

“These, we should expect, ought rather to put her in mind of the sentiments which her real complexion would excite, and mortify her the more by the contrast. To be pleased with such groundless applause is a proof of the most superficial levity and weakness. It is what is properly called vanity, and is the foundation of the most ridiculous and contemptible vices, the vices of affectation and common lying; follies which, if experience did not teach us how common they are, one should imagine the least spark of common sense would save us from. The foolish liar, who endeavours to excite the admiration of the company by the relation of adventures which never had any existence; the important coxcomb, who gives himself airs of rank and distinction which he well knows he has no just pretensions to; are both of them, no doubt, pleased with the applause which they fancy they meet with.” source