耳朵是负责听的，听了之后再加以审察，这叫做聪明。

When a person realizes he has been deeply heard, his eyes moisten. I think in some real sense he is weeping for joy. It is as though he were saying, "Thank God, somebody heard me. Someone knows what it's like to be me."

化学的艺术在于分离、识别和量化不同物质的能力。