The real solution lies in a world in which charity will have become unnecessary.
To every action there is always an equal and opposite or contrary, reaction
I do not know how to teach philosophy without becoming a disturber of the peace.
If you can't explain it simply, you don't understand it well enough.
The books that the world calls immoral are books that show the world its own shame.
Science is not only a disciple of reason but, also, one of romance and passion.
If one cannot enjoy reading a book over and over again, there is no use in reading it at all.
Real knowledge is to know the extent of one's ignorance.
Imagination is more important than knowledge.
Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.
Books! I dunno if I ever told you this, but books are the greatest gift one person can give another.
With educated people, I suppose, punctuation is a matter of rule; with me it is a matter of feeling. But I must say I have great respect for the semi-colon; it's a useful little chap.
For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.
In mathematics you don't understand things. You just get used to them.
Study without desire spoils the memory, and it retains nothing that it takes in.
Necessity is the mother of invention.
It is better to know how to learn than to know.
Any man who reads too much and uses his own brain too little falls into lazy habits of thinking.
Many much-learned men have no intelligence.
The progressive development of man is vitally dependent on invention.
I decided to teach because I think that any person who studies philosophy has to be involved actively.