One cannot conceive anything so strange and so implausible that it has not already been said by one philosopher or another.

Three passions, simple but overwhelmingly strong, have governed my life: the longing for love, the search for knowledge, and unbearable pity for the suffering of mankind.

The most crucial use of knowledge and education is to understand the importance of developing a good heart.

There is nothing so absurd or ridiculous that has not at some time been said by some philosopher.

He who has so little knowledge of human natures as to seek happiness by changing anything but his own disposition will waste his life in fruitless efforts.

I keep six honest serving men (they taught me all I knew); Their names are What and Why and When And How and Where and Who.

No man can reveal to you aught but that which already lies half asleep in the dawning of your knowledge.

Cherish that which is within you, and shut off that which is without; for much knowledge is a curse.

The good life is one inspired by love and guided by knowledge.

When you know a thing, to hold that you know it; and when you do not know a thing. To allow that you do not know it—this is knowledge.