What is the main idea of Phyllis Wheatley's "On Imagination"?

The speaker personifies Imagination as a potent and wondrous queen in the first stanza. In the second stanza, the speaker implores Helicon, the source of poetic inspiration in Greek mythology, to aid them in making a song glorifying Imagination. Fancy, introduced in the third stanza, wanders looking for something to love until she is struck and bound by some love object.