Childhood is fleeting, but the right book can make it last a little longer.

Lock up your libraries if you like; but there is no gate, no lock, no bolt that you can set upon the freedom of my mind.

The wild is a place of extremes. To survive, you have to embrace both the highs and the lows.

In science, we try to explain what we don't understand. In mathematics, we try to understand what we can't explain.