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This sonnet is similar to number 18, discussing love and its stalwart nature, unshaken by the tempest or untrimmed by nature's course.
"Admit" could mean to either give in, or can be seen as a nod to those who oppose love, and possible want to unravel it and its purposes. It can also show a strength in love.
"Love's not Time's fool... within his bending sickle's compass come" refers to love lasting time, and to the end. It does not die. Along with that, the end couplet then attempts to support this claim, by saying that if love dies before death itself occurs, then it was not truly love that existed.
"Ever-fixed mark," "looks on tempests unshaken," "the star to every wandering bark" all allude to the strength of love.
The volta after line 8 gives love a sort of attitude, and feels more powerful and forceful as a result, because it is strong and shown as strong in the proceeding lines - the volta shows that strength.