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

When I am attacked by gloomy thoughts, nothing helps me so much as running to my books. They quickly absorb me and banish the clouds from my mind.

The reading of all good books is like conversation with the finest men of past centuries.

The highest activity a human being can attain is learning for understanding, because to understand is to be free.

If you're teaching today what you were teaching five years ago, either the field is dead or you are.

The more I read, the more I acquire, the more certain I am that I know nothing.

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

I am so clever that sometimes I don't understand a single word of what I am saying.

Better know nothing than half-know many things.

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

I do not know how to teach philosophy without becoming a disturber of the peace.

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

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

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

Learning never exhausts the mind.

A child miseducated is a child lost.

I learned very early the difference between knowing the name of something and knowing something.

A little knowledge is a dangerous thing. So is a lot.

To every action there is always an equal and opposite or contrary, reaction

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

Education is an admirable thing, but it is well to remember from time to time that nothing that is worth knowing can be taught.