One way to look at the mutual indwelling of the Trinity is to think of the Trinity as being in an eternal dance—a dance that the Trinity wishes for humanity join! But because of sin, humanity cannot join in the dance except by salvation through Jesus Christ, the second person of the Trinity. In John 17:22–23 Jesus prays, “The glory that you have given me I have given to them, that they may be one even as we are one, I in them and you in me, that they may become perfectly one, so that the world may know that you sent me and loved them even as you loved me” (Vander Zee, “The Holy Trinity”).
Watch ballroom dance competitions. The dancing can become intimate between the man and woman, but they move as one unit. Consider also dance numbers for musical theater. The chorus moves together; if just one person is off, the dance is ruined.