没有终局的成功，也没有致命的失败， 重要的是继续前进的勇气。

The essence of modernity is psychologism, the experiencing and interpretation of the world in terms of the reactions of our inner life and indeed as an inward world.

Mathematics is the key to understanding the universe.

民主不是旁观者的运动。它需要积极参与和对社会正义的承诺。