How do the speakers references to the "soul" and "ideal grace" in lines 3 and 4 of sonnet 43 by elizabeth barrett browning affect the way readers view the love between the speaker and her beloved?

It could be said that speakers used a spatial metaphor in order to portray love. It seems that love is a 3d substance filling the soul. Also, love is extended as her soul in many directions and it is even question whether the love and soul are the same thing. Then the speakers are trying to guess what feeling is and how far her soul can get into the world.