It is harmful to be deaf to what is happening in the world.

充耳不闻天下事是有害的.

But don't be deaf to hear it from the person who says it with his heart.

但是，如果有人真心说出这些话的时候，请不要装聋作哑。

Be deaf to your colleagues' personal conversations. Don't reference anything you overheard and, for heaven's sake, don't throw in your two cents.

对同事的私人对话充耳不闻。不要提及不小心听到的任何内容，而且千万不要插嘴。