My mind is my weapon. My brother has his sword, King Robert has his warhammer, and I have my mind... And a mind needs books as a sword needs a whetstone, if it is to keep its edge.

Collaboration across sectors is the key to solving the world's most pressing environmental challenges.

We should not only pursue profits, but also the contribution to society.

Simplicity is the ultimate sophistication.

I write to make the invisible visible.

The art of teaching consists in large part of the ability to awaken the natural curiosity of young minds and to satisfy it with the nourishment of knowledge.