Accept challenges, so that you may feel the exhilaration of victory.

I will love the light for it shows me the way, yet I will endure the darkness because it shows me the stars.

I am not an optimist, but a great believer of hope.

Pure mathematics is, in its way, the poetry of logical ideas.

Setting goals is the first step in turning the invisible into the visible

Imagination is more important than knowledge.

It is the supreme art of the teacher to awaken joy in creative expression and knowledge.