How does Milton resolve that problem in the sestet (last six lines)?

In the sestet of a Petrarchan Sonnet, Milton typically presents a resolution or reflection on the problem or theme introduced in the octave. This section often offers a twist in thinking or a shift in perspective that leads to a conclusion or moral lesson. Milton's resolution in the sestet is characterized by a reflective and meditative tone, tying together the themes and ideas explored in the preceding octave.