Power comes not from knowledge kept but from knowledge shared.

Books are infinite in number and time is short. The secret of knowledge is to take what is essential. Take that and try to live up to it.

There's no such thing in aging, but maturing and knowledge. It's beautiful, I call that beauty.

Ignorance is the curse of God; knowledge is the wing wherewith we fly to heaven.

The limit of man's knowledge in any subject possesses a high interest which is perhaps increased by its close neighbourhood to the realms of imagination.

I believe there exists, & I feel within me, an instinct for the truth, or knowledge or discovery, of something of the same nature as the instinct of virtue, & that our having such an instinct is reason enough for scientific researches without any practical results ever ensuing from them.