Half done!

This is the halfway point  J  There are 154 sonnets in all, and this one is number 77:

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LXXVII

  Thy glass will show thee how thy beauties wear,

  Thy dial how thy precious minutes waste;

  These vacant leaves thy mind's imprint will bear,

  And of this book, this learning mayst thou taste.

  The wrinkles which thy glass will truly show

  Of mouthed graves will give thee memory;

  Thou by thy dial's shady stealth mayst know

  Time's thievish progress to eternity.

  Look! what thy memory cannot contain,

  Commit to these waste blanks, and thou shalt find

  Those children nursed, deliver'd from thy brain,

  To take a new acquaintance of thy mind.

    These offices, so oft as thou wilt look,

    Shall profit thee and much enrich thy book.

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Okay, a volta at the Look! at the beginning of the third quatrain, and then a turn in three stages, through commit and shalt  in line 10 and shall  at the beginning of the last line.The so oft as thou wilt look in the penultimate line connects back beautifully to the glass and the dial.