What is the image in M.C. Bond of Union?

In the poem "M.C. Bond of Union," the main image or central metaphor is that of a bond -- specifically, the bond of union that exists between the speaker and their beloved. This bond is depicted as something strong, enduring, and unbreakable, likened to a chain that holds them together. The poem explores the depth of this connection and the ways in which it brings comfort, joy, and resilience to the speaker, particularly in the face of challenges and hardships.