You can't let praise or criticism get to you. It's a weakness to get caught up in either one.

The greatest happiness of life is the conviction that we are loved; loved for ourselves, or rather, loved in spite of ourselves.

Not all of us can do great things.

The amount of happiness that you have depends on the amount of freedom you have in your heart.

Mathematics is the key and door to the sciences.

Success is not about seeking constant external recognition; it's about finding fulfillment and purpose in the impact you have on the world around you.

Until they become conscious, they will never rebel, and until after they have rebelled, they cannot become conscious.