事实上，光的理论是我非常感兴趣的研究课题，我对光的本质形成了明确的看法。

儿童是通过努力从事活动，从而使个人得到发展的。

If you do not tell the truth about yourself you cannot tell it about other people.

The greatest weapon against stress is our ability to choose one thought over another.

如果你收养了一只饥饿可怜的狗，并且让它舒适顺利，它将不会咬你，这便是一个人与一只狗之间最主要的差别。

I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones。

我们必须立即行动，因为海洋的衰退是我们不能忽视的危机。