The original sentences are as follow [emphasis supplied]: 

> 
> "The obsessive desire that often accompanies passionate love can degrade affection, ..., and sharing the life of another. It is the diametric opposite of altruistic love. It arises from egocentrism that merely cherishes itself ***in*** the other or, worse still, seeks to forge its own happiness at the other's expense."
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Can I use "from" or "at" in replace of "in"? And why?
As a Taiwanese, I intend to use "from", however it is clearly not right. Please tell me why?