Never suppose that in any possible situation or under any circumstances that it is best for you to do a dishonorable thing however slightly so it may appear to you... Encourage all your virtuous dispositions, and exercise them whenever an opportunity arises, being assured that they will gain strength by exercise... and that exercise will make them habitual...

Memoirs Corespondence and Private Papers of Thomas Jefferson Late, President of the United States (ed. 1829)