The one you buy will be the only one that doesn't work.

Intelligence is the ability to adapt to change.

None but ourselves can free our minds.

If we do not lay out ourselves in the service of mankind whom should we serve?

Intelligence is a moral category.

Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more

Wise men speak because they have something to say; Fools because they have to say something.

If you only read the books that everyone else is reading, you can only think what everyone else is thinking.

Energy may be likened to the bending of a crossbow; decision,to the releasing of a trigger.

If you are neutral in situations of injustice, you have chosen the side of the oppressor.

All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.

You can be rich in spirit, kindness, love and all those things that you can't put a dollar sign on.

Today you are you! That is truer than true! There is no one alive who is you-er than you!

Time flies over us, but leaves its shadow behind.

Turn your wounds into wisdom.

Experience keeps a dear school, but fools will learn in no other.

Nobody has the power to take two steps together; you can take only one step at a time.

Your visions will become clear only when you can look into your own heart. Who looks outside, dreams; who looks inside, awakes.

We are all born ignorant, but one must work hard to remain stupid

Courage is resistance to fear, mastery of fear - not absence of fear.

What a liberation to realize that the “voice in my head” is not who I am. Who am I then? The one who sees that.