The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.
最难的事情是变得简单。
The only limit to our realization of tomorrow will be our doubts of today.
In the desert, I found a freedom that the city could never offer.
We must respect nature’s wisdom while advancing scientific progress.