When you do something best in the world, you can’t really improve on that.
It's all about trying to be a little less ignorant and a little less selfish every day.
The most exciting thing is when you suddenly see the solution to a problem that has been puzzling you for a long time.
太阳是我们在非洲最强大的工具。我们必须学会与它合作，而不是对抗它。
Every tree planted today is a legacy for tomorrow.
"Writing is a way of talking without being interrupted."
The biggest room in the world is the room for improvement.