儿童的一切教育都必须遵循一个原则，即帮助孩子身心自然的发展。

As long as man continues to be the ruthless destroyer of lower living beings， he will never know health or peace. For as long as men massacre animals， they will kill each other.

Words have power—use them wisely.

基本物理现象中的偶然性并非由于我们对隐藏原因的无知，而是自然界的基本属性。