"I want to write books that make children think and feel."
Life is ours to be spent, not to be saved.
The true value of a forest cannot be measured in board feet alone.
I'm not going to let anyone tell me what to do.
No hay nada más peligroso que la idea de un solo hombre.
在任何科学事业中取得成功都需要非凡的能力、勤奋和精力。
A clear vision turns obstacles into stepping stones.