The world we have created is a product of our thinking.

We must recognize what in our accepted tradition is damaging to our fate and dignity-and shape our lives accordingly.

Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.

The years of anxious searching in the dark, with their intense longing, their alternations of confidence and exhaustion and the final emergence into the light -- only those who have experienced it can understand it.

Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Failing isn't bad when you learn what not to do.

Imagination is more important than knowledge. Imagination is the language of the soul. Pay attention to your imagination and you will discover all you need to be fulfilled.