The goal of cryptography is to make it so that the cost of breaking the system exceeds the value of the information protected.

对圣贤的道理教导别人很容易，自己实践却是不容易的事。对圣贤的道理开始奋斗很容易，但坚持到底却很难。圣贤的道理与实践相结合，行仁政必本与德性。后代则相反，学问与实践不能统一，不修持自己的德性，而只管治理别人。

Water runs dry but hearts never do

The human mind is so complex and things are so tangled up with each other that, to explain a blade of grass, one would have to make a diagram of the universe.

盈利和环境管理并不相互排斥；它们必须齐头并进。

一个人和他想要的生活之间唯一的障碍往往只是尝试的意愿和相信它可能的信念。