The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.

The more we realize our minuteness and our impotence in the face of cosmic forces, the more astonishing becomes what human beings have achieved.

可持续采石不是选择，而是我们对后代的责任。

The historian must be a poet and a philosopher.

行动要果断有力，修养要不断磨练。