With Sonnet 102, William Shakespeare returns to addressing his young lover directly, though still in explanation and indeed defence of the extended period of silence of which Sonnets 100 & 101 spoke, both of which were addressed to his own Muse, admonishing her for her absence.
In contrast to those two poems, Sonnet 102 takes full responsibility for the dearth of praises sung in sonnet form to the young man and sets out its reasoning in an argument that is so elaborate, it doesn't quite fit the form: Shakespeare never actually manages to finish his sentence that covers the entirety of the second and third quatrain, which gives the poem an almost improvised quality that may or may not be fully intended.