Never stop learning because the world never stops changing.
永远不要停止学习，因为世界永远不会停止变化。
If you want to live a happy life, tie it to a goal, not to people or things.
Of all the means which wisdom acquires to ensure happiness throughout the whole of life, by far the most important is friendship.
知识的每一次进步都会带来新的问题和新的困难。
I don’t write for an audience. I write for myself.
死亡很可能是唯一的、最好的生命创造。它是生命的促变者。它送走老一代，给新一代开出道路。