We are just an advanced breed of monkeys on a minor planet of a very average star. But we can understand the Universe. That makes us something very special.
I have nothing to declare except my genius.
Those who cannot change their minds cannot change anything.
You don't write because you want to say something, you write because you have something to say.
I cannot teach anybody anything. I can only make them think.
Books are the mirrors of the soul.
Wonder is the beginning of wisdom.
Be more concerned with your character than your reputation, because your character is what you really are, while your reputation is merely what others think you are.
No army can withstand the strength of an idea whose time has come.
You can fool some of the people all of the time, and all of the people some of the time, but you can not fool all of the people all of the time.
Experience is not what happens to a man; it is what a man does with what happens to him.
Freedom is nothing but a chance to be better.
As a well spent day brings happy sleep, so life well used brings happy death.
The mind, once stretched by a new idea, never returns to its original dimensions.
Pleasure in the job puts perfection in the work.
Think for yourself and let others enjoy the privilege of doing so too.
There are three classes of people: those who see. Those who see when they are shown. Those who do not see.
The first principle is that you must not fool yourself and you are the easiest person to fool.
Start with the end in mind.
If you think education is expensive, try ignorance.