It is in fact easy to see that many of the differences which distinguish men are merely the effect of habit and the different methods of life men adopt in society.
 Jean-Jacques Rousseau, Discourse on the Origin of Inequality Among Men (1755). copy citation

add
Author Jean-Jacques Rousseau
Source Discourse on the Origin of Inequality Among Men
Topic society difference
Date 1755
Language English
Reference
Note Translated by G. D. H. Cole
Weblink https://en.wikisource.org/wiki/Discourse_on_the_Origin_of_Inequality_Amo...

Context

“If I have expatiated at such length on this supposed primitive state, it is because I had so many ancient errors and inveterate prejudices to eradicate, and therefore thought it incumbent on me to dig down to their very root, and show, by means of a true picture of the state of nature, how far even the natural inequalities of mankind are from having that reality and influence which modern writers suppose. It is in fact easy to see that many of the differences which distinguish men are merely the effect of habit and the different methods of life men adopt in society. Thus a robust or delicate constitution, and the strength or weakness attaching to it, are more frequently the effects of a hardy or effeminate method of education than of the original endowment of the body.” source