We think in generalities, but we live in detail.
Speech is human nature itself, with none of the artificiality of written language.
I would be a billionaire if I was looking to be a selfish boss. That's not me.
One main factor in the upward trend of animal life has been the power of wandering.
The safest general characterization of the European philosophical tradition is that it consists of a series of footnotes to Plato.
Wisdom alone is true ambition's aim, wisdom is the source of virtue and of fame; obtained with labour, for mankind employed, and then, when most you share it, best enjoyed.
Everything of importance has been said before by somebody who did not discover it.
It is in literature that the concrete outlook of humanity receives its expression.
It takes an extraordinary intelligence to contemplate the obvious.
Civilization advances by extending the number of important operations which we can perform without thinking of them.
Every philosophy is tinged with the coloring of some secret imaginative background, which never emerges explicitly into its train of reasoning.
Fundamental progress has to do with the reinterpretation of basic ideas.
But you can catch yourself entertaining habitually certain ideas and setting others aside; and that, I think, is where our personal destinies are largely decided.
If a dog jumps into your lap, it is because he is fond of you; but if a cat does the same thing, it is because your lap is warmer.
The deepest definition of youth is life as yet untouched by tragedy.
Civilizations can only be understood by those who are civilized.
The vitality of thought is in adventure. Ideas won't keep. Something must be done about them. When the idea is new, its custodians have fervor, live for it, and if need be, die for it.
True courage is not the brutal force of vulgar heroes, but the firm resolve of virtue and reason.
Almost all really new ideas have a certain aspect of foolishness when they are first produced.
Not ignorance, but ignorance of ignorance, is the death of knowledge.
Knowledge shrinks as wisdom grows.