皮革的真正价值在于其耐用性和永恒的吸引力，而不仅仅是其美观性。
Mental life is a continuous adjustment to internal and external demands.
The boundaries of our knowledge are the frontiers of our curiosity.
The most important thing in science is not to stop questioning.
The greatest question of our time is not communism versus individualism, not Europe versus America, not even the East versus the West; it is whether man can bear to live without God.