没有充足的食物供应，今天所知道的文明就不可能进化，也不可能生存。
空白页是世界上最可怕又最令人兴奋的东西。
数学中发现的快乐就像解开宇宙留给我们的谜题。
"The major threats to survival that our ancestors faced - predators, starvation, disease - left their mark on our fears and anxieties."
The child is not a passive recipient of knowledge but an active participant in the learning process.
唯一行为理智的人是我的裁缝，他每次见我都会重新量尺寸，而其他人则继续用旧的尺寸。
Courage doesn't always roar. Sometimes courage is the quiet voice at the end of the day saying, "I will try again tomorrow."