The history of the past interests us only in so far as it illuminates the history of the present.
Ideas are the roots of creation.
Do not read good books-life is too short for that-read only the best.
Learn to attack things frontally but according to the most scientific methods.
Americans cannot realize how many chances for mental improvement they lose by their inveterate habit of keeping six conversations when there are twelve in the room.
Prejudices subsist in people's imagination long after they have been destroyed by their experience.