In Shakespeare's The Merchant of Venice, Portia has three jewel boxes, one is gold, the other is silver and the other is copper. In one of these three boxes, there is a portrait of Portia. Boya's suitor must choose one of these three boxes. If he is lucky enough, or smart enough, and there is a portrait of Portia in the box he chooses, he can announce that he will marry Portia.

The golden box is "what everyone wants", and what mocks the mainstream of society is actually false. The silver box is "worth having", which is a metaphor for the self-righteous quality. Lead boxes require self-sacrifice. This shows the essence of true love. The difference between liking and loving is that liking is to get, while loving is to pay. Getting ready is the real love psychology.