He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast.
只热爱实践而无理论的人,就像没有舵和罗盘的水手,永远不知道他可能漂流到哪里。
I think it's very important to have a feedback loop, where you're constantly thinking about what you've done and how you could be doing it better.
A theory should not attempt to explain all the facts, because some of the facts are wrong.