In programming, everything we do is a special case of something more general -- and often we know it too quickly.

Pig farming is a technical job, but more importantly, a conscientious job.

The future is always changing, but the past is always the same.

解释：砍伐树木不把树根砍掉，必能重新生长；堵塞水不把源头堵住，必会重新流出；消除祸患不铲除产生祸患的根基，祸患还会再生。