Never look back unless you are planning to go that way.
永远不要回头看，除非你想走回去。
粒子的概念只是一种近似，仅在特定极限情况下有效。
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 inner world, the dissolution of fixed contents in the fluid element of the soul, from which all that is substantive is filtered and whose forms are merely forms of motion.
The secret of joy in work is contained in one word – excellence. To know how to do something well is to enjoy it.
