The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.

Where knowledge ends, religion begins.

Knowledge makes us accountable.

I think this is the most extraordinary collection of talent, of human knowledge, that has ever been gathered together at the White House, with the possible exception of when Thomas Jefferson dined alone. Address at a White House dinner honoring Nobel Prize winners (April 1962)

The more extensive a man's knowledge of what has been done, the greater will be his power of knowing what to do.

The best way to become acquainted with a subject is to write a book about it.

To be conscious that you are ignorant of the facts is a great step to knowledge.

It is knowledge that influences and equalises the social condition of man; that gives to all, however different their political position, passions which are in common, and enjoyments which are universal. Speech at the Manchester Athenaeum (1844-10-23)