The causal framework is the foundation of scientific reasoning.

Man is the measure of all things: of things which are, that they are, and of things which are not, that they are not.

We can distinguish the blurred shapes and colours we see at a distance only because of the capacities of our eyes.

因此，国家并非自古以来就存在。曾经有一些社会没有国家，对国家或国家权力毫无概念。在一定的经济发展阶段，这必然与社会分裂成阶级有关，国家变成了一种必要性。

The stage is my second home, I feel extremely happy every time I stand on it.

To write is to listen—to the voices within and the world outside.