The Unity Church interprets the religious terms Father, Son,
and Holy Spirit Metaphysically, as three aspects of mind action: mind, idea, and expression.
I don't know if he meant this physically or Metaphysically, though both work, but it definitely is a great metaphor for life.
It doesn't have to be a formal marriage, but by making that commitment, Metaphysically you will bounce off your partner,
and your partner will bounce off you, and bit by bit you can build each other up.