对自然的研究是永恒的乐趣。
The study of nature is a perpetual joy.
中年之后，只有已为告别人生做好准备的人，才能继续在生活中朝气蓬勃。
The human heart is the most deceitful of all things, and desperately wicked. Who really knows how bad it is?
友情是超越时间的纽带。
预测未来的最好方法就是去创造它。