The next good quality belonging to a gentleman, is good breeding [manners]. There are two sorts of ill-breeding: the one a sheepish bashfulness, and the other a mis-becoming negligence and disrespect in our carriage; both of which are avoided by duly observing this one rule, not to think meanly of ourselves, and not to think meanly of others.

Sec. 141 - Some Thoughts Concerning Education (1693)