If you're teaching today what you were teaching five years ago, either the field is dead or you are.
We could never learn to be brave and patient, if there were only joy in the world
My alma mater was books, a good library.... I could spend the rest of my life reading, just satisfying my curiosity.
The more I read, the more I acquire, the more certain I am that I know nothing.
The whole of science is nothing more than a refinement of everyday thinking.
What is freedom of expression? Without the freedom to offend, it ceases to exist.
Never help a child with a task at which he feels he can succeed.
Study without desire spoils the memory, and it retains nothing that it takes in.
That men do not learn very much from the lessons of history is the most important of all the lessons that history has to teach.
Many much-learned men have no intelligence.
Science is a way of thinking much more than it is a body of knowledge.
Education is an ornament for the prosperous, a refuge for the unfortunate.
Dare to think for yourself.
Books are for people who wish they were somewhere else.
There is no authority who decides what is a good idea.
A thought is an idea in transit.
The highest activity a human being can attain is learning for understanding, because to understand is to be free.
If there were no bad people, there would be no good lawyers.
It is better to know how to learn than to know.
The fullness of knowledge only comes through the awareness of ignorance.
Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.