I think that’s the single best piece of advice: constantly think about how you could be doing things better and questioning yourself.

解析：教导学生，不到他想弄明白而不得的时候，不去开导他；不到他想出来却说不出来的时候，不去启发他。

All language is but a poor translation.

I know of only one duty, and that is to love.