永远不要停止学习，因为世界永远不会停止变化。
Never stop learning, because the world never stops changing.
The best scientists are those who remain humble in the face of the unknown.
The wisdom of hindsight, so useful to historians and indeed to authors of memoirs, is sadly denied to practising politicians.
The advancement of mathematics is through generalization.
译文：做好事就像登山一样艰难，做坏事就像山崩一样容易。