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.

The old-fashioned dictator does not exist under scientific management.

In energy, the only constant is change—embrace it.

地球上生命的未来取决于我们采取行动的能力。许多人正在尽其所能，但只有我们的社会、经济和政治发生变化，才能取得真正的成功。