He used a phrase I hate: "You have to be cruel to be kind."

他用了一句我讨厌的习语：“要想善良，就得残忍。”

A dentist has to be cruel to be kind.

牙科医生是为仁术而不得不残酷的。

Sometimes you have to be cruel to be kind.

有时候你为了真正为对方好必须狠心。

The coach had to be cruel to be kind to his trainees.

教练为了对他的受训者仁慈就要对他们残酷。

Thee coach had to be cruel to be kind to his trainees.

教练为了对他的受训者仁慈就要对他们残酷。

I had to be cruel to be kind and warn him that he'd lose his job if he didn't improve his performance.

我只得忠言逆耳地警告他，如果他的表现不改进的话，他会失业的。

Sometimes you must be cruel to be kind, and so the teacher made Jones stay in after class to teach him a lesson!

有时你必须心慈手辣，下课后老师要琼斯留下来教训一下他。

When you are tempted to be cruel, to criticize or tease, decide to be kind instead.

当你被诱惑去残忍，去责备，去嘲笑的时候，下定决心用一颗友善的心去对待。