Human behavior flows from three main sources: desire, emotion, and knowledge

The idea is to try to give all the information to help others to judge the value of your contribution; not just the information that leads to judgment in one particular direction or another.

Science is a way of thinking much more than it is a body of knowledge.

A man who has never gone to school may steal a freight car; but if he has a university education, he may steal the whole railroad.

It isn't what we don't know that gives us trouble, it's what we know that ain't so.

What is now proved was once only imagined.

The ability to observe without evaluating is the highest form of intelligence.

Know what you are talking about.

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

Education is the most powerful weapon which you can use to change the world.

I think that kids have a greater capacity for processing things than we give them credit for.

Dare to think for yourself.

If the facts don't fit the theory, change the facts.

Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.

It is beyond a doubt that all our knowledge begins with experience.

All stable processes we shall predict. All unstable processes we shall control.

Seek knowledge from the cradle to the grave.

All sciences are vain and full of errors that are not born of Experience, the mother of all Knowledge.

Civilization is a race between disaster and education.

If you want the present to be different from the past, study the past.

Courage, conviction and confidence.