For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.

The highest result of education is tolerance.

A cynic is a man who knows the price of everything, and the value of nothing.

Know what you are talking about.

Learning never exhausts the mind.

Reading is to the mind what exercise is to the body.

Opinion is the medium between knowledge and ignorance.

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

The schools ain't what they used to be and never was.

I cannot teach anybody anything. I can only make them think

If you can't explain it simply, you don't understand it well enough.

I cannot live without books.

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

Imagination is more important than knowledge.

The most important part of teaching is to teach what it is to know.

Education is our passport to the future, for tomorrow belongs to the people who prepare for it today.

Courage, conviction and confidence.

One test of the correctness of educational procedure is the happiness of the child.

A witty saying proves nothing.

Better know nothing than half-know many things.

Knowledge, Action, Devotion are complementary to each other.