Education is the methodical creation of the habit of thinking.
The history of the past interests us only in so far as it illuminates the history of the present.
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.
The happiness of most people is not ruined by great catastrophes or fatal errors, but by the repetition of slowly destructive little things.
Too often we forget that genius ... depends upon the data within its reach, that Archimedes could not have devised Edison's inventions.
