By oft repeating an untruth, men come to believe it themselves.

When we get piled upon one another in large cities, as in Europe, we shall become as corrupt as Europe.

He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors.

Errors of opinion may be tolerated where reason is left free to combat it.

The idea of creating a national bank I do not concur in, because it seems now decided that Congress has not that power (although I sincerely wish they had it exclusively), and because I think there is already a vast redundancy rather than a scarcity of paper medium.

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.

I never saw an instance of one or two disputants convincing the other by argument.