The first duty of the sovereign， that of protecting the society from the violence and invasion of other independent societies， can be performed only by means of a military force.

The beauty of mathematics lies in its ability to describe the universe in the most elegant and concise way.

没有野生动物的森林就像没有音乐的交响乐。

群众的鼻子是他们的想象力。通过这一点，任何时候都可以悄悄地引导他们。