It seems to me that the natural world is the greatest source of excitement; the greatest source of visual beauty; the greatest source of intellectual interest. It is the greatest source of so much in life that makes life worth living.

写作是唯一一件当我做它时，我不觉得我应该在做其他事情的事情。

Motto for a research laboratory: What we work on today, others will first think of tomorrow.

未说出口的往往比说出的更有力量。

民主的未来取决于民主社会自我改革和适应新挑战的能力。