Wikiquote no longer allows unsourced quotations, and they are in process of being removed from our pages (see Wikiquote:Limits on quotations); but if you can provide a reliable, precise and verifiable source for any quote on this list please move it to Henry Brooks Adams. --Antiquary 19:30, 22 September 2009 (UTC)
- Absolute liberty is absence of restraint; responsibility is restraint; therefore, the ideally free individual is responsible to himself.
- Everyone carries his own inch-rule of taste, and amuses himself by applying it, triumphantly, wherever he travels.
- Henry James chews more than he bites off.
- I have written too much history to have faith in it; and if anyone thinks I'm wrong, I am inclined to agree with him.
- It is impossible to underrate human intelligence— beginning with one's own.
- Man is an imperceptible atom always trying to become one with God.
- No historian can take part with— or against— the forces he has to study. To him even the extinction of the human race should merely be a fact to be grouped with other vital statistics.
- No man likes to have his intelligence or good faith questioned, especially if he has doubts about it himself.
- No man, however strong, can serve ten years as schoolmaster, priest, or Senator, and remain fit for anything else.
- Philosophy: unintelligible answers to insoluble problems.
- Politics, as a practice, whatever its professions, has always been the systematic organization of hatreds.
- The woman who is known only through a man is known wrong.
- The work of internal government has become the task of controlling the thousands of fifth-rate men.
- There is no such thing as an underestimate of average intelligence.