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“Marriage is not a simple love affair, it’s an ordeal, and the ordeal is the sacrifice of ego to a relationship in which two have become oneâ€
 Joseph Campbell quotes (American prolific Author, Editor, Philosopher and Teacher, 1904-1987)
Not sure where he said this. Makes good sense, but it is only one part of the story. Whatever ego is may need to be sacrificed for the relationship, for the oneness. But on the other hand fusion has to be refused, and the self has to be found, the adult nurtured into existence and differentiated from the blur.
Two become one and one becomes two.