Thy soul, the fix'd foot, makes no show
To move, but doth, if th' other do. (27-28)
Talk about being joined at the hip… er, compass. This metaphor underscores the powerful bonds of love: if one part of the pair moves, the other must move as well.
Thy firmness makes my circle just,
And makes me end where I begun. (35-36)
Everything comes full circle at the end of the poem, with the promised reunion. Importantly, it's the wife of the speaker (specifically her "firmness" in his absence) that will be responsible for bringing him back and reuniting their love. Aww.