I do not know which makes a man more conservative -- to know nothing but the present, or nothing but the past."
A study of the history of opinion is a necessary preliminary to the emancipation of the mind.
"It is ideas, not vested interests, which are dangerous for good or evil."
"The difficulty lies, not in the new ideas, but in escaping from the old ones which ramify . . . into every corner of our minds."
"Most men love money and security more, and creation and construction less, as they get older."