老脑筋就像老马；如果你想保持它们的工作状态，就必须锻炼它们。
Old minds are like old horses; you must exercise them if you wish to keep them in working order.
The sky is not the limit; it is the beginning.
Life is a training for the soul.
If you want to grow, you must first learn to adapt.
我们都是时间的移民。
孩子是最苛刻的观众，但也是最值得的。
要理解一个民族，你必须先理解他们的故事。
Every sensation we feel is the result of intricate molecular mechanisms.
