The books that the world calls immoral are books that show the world its own shame.

In mathematics you don't understand things. You just get used to them.

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

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

Dare to think for yourself.

It is not enough for the teacher to love the child. She must first love and understand the universe. She must prepare herself, and truly work at it.

The only good is knowledge and the only evil is ignorance.

A thought is an idea in transit.

The secret of life is not enjoyment but education through experience.

Any knowledge that doesn't lead to new questions quickly dies out: it fails to maintain the temperature required for sustaining life.

A child miseducated is a child lost.

It took us three years to build the NeXT computer. If we'd given customers what they said they wanted, we'd have built a computer they'd have been happy with a year after we spoke to them - not something they'd want now.

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

The whole of science is nothing more than a refinement of everyday thinking.

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

A child educated only at school is an uneducated child.

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

A witty saying proves nothing.

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

Knowledge, Action, Devotion are complementary to each other.

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