The first principle is that you must not fool yourself and you are the easiest person to fool.
We could never learn to be brave and patient, if there were only joy in the world
Knowing is not enough; we must apply. Willing is not enough; we must do.
Most people have never learned that one of the main aims in life is to enjoy it.
What is now proved was once only imagined.
Imagination is more important than knowledge.
Human behavior flows from three main sources: desire, emotion, and knowledge
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.
The task of a writer is not to solve the problem but to state the problem correctly.
When you know better you do better.
Science is not only a disciple of reason but, also, one of romance and passion.
In order to stave off covetouness, greed, and spite, citizens world over must be educated.
A thought is an idea in transit.
The books that the world calls immoral are books that show the world its own shame.
The direction in which education starts a man will determine his future in life
Language is courage: the ability to conceive a thought, to speak it, and by doing so to make it true.
The highest result of education is tolerance.
Real knowledge is to know the extent of one's ignorance.
For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.
There is one quality which one must possess to win, and that is definiteness of purpose, the knowledge of what one wants, and a burning desire to possess it.
I cannot teach anybody anything. I can only make them think