It is said that one should put others before oneself, but isn't this impossible?

It is said that one should put others before oneself, but isn't this impossible?

It is said that one should put others before oneself, but isn't this impossible? Consider two people, Mr A and Miss B. If A succeeds in putting B before himself, B can't put A before herself. Hasn't B been forced into being selfcentred by A?

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