The most savage controversies are those about matters as to which there is no good evidence either way.

Dare to think for yourself.

If there were no bad people, there would be no good lawyers.

Physics is like sex: sure, it may give some practical results, but that's not why we do it.

Science is a rising force, It is creating a new world about us. It needs to be watched and pressed into service, and in any case, it would be courting disaster to ignore it.

The man who is fond of books is usually a man of lofty thought, and elevated opinions.

In order to stave off covetouness, greed, and spite, citizens world over must be educated.

With educated people, I suppose, punctuation is a matter of rule; with me it is a matter of feeling. But I must say I have great respect for the semi-colon; it's a useful little chap.

What is freedom of expression? Without the freedom to offend, it ceases to exist.

Technology is just a tool. In terms of getting the kids working together and motivating them, the teacher is the most important.

I have no special talents. I am only passionately curious.

Investigate, educate and organize.

God created man in His own image, says the Bible; philosophers reverse the process: they create God in theirs.

Just because I don't care doesn't mean I don't understand.

Reading without reflecting is like eating without digesting.

Know what you are talking about.

Courage, conviction and confidence.

Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.

Seek knowledge from the cradle to the grave.

Liberty without Learning is always in peril and Learning without Liberty is always in vain.

I am a part of everything that I have read.