There is a principle which is a bar against all information, which is proof against all arguments and which cannot fail to keep a man in everlasting ignorance - that principle is contempt prior to investigation. (quote attributed to Spencer is from the second appendix to the fourth edition of the Alcoholics Anonymous book.)

Every man is free to do that which he wills, provided he infringes not the equal freedom of any other man.

Those who cavalierly reject the Theory of Evolution, as not adequately supported by facts, seem quite to forget that their own theory is supported by no facts …

As there must be moderation in other things, so there must be moderation in self-criticism. Perpetual contemplation of our own actions produces a morbid consci…