Volta project: Two weeks down!

The sonnet on this Sunday:

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XIV

  Not from the stars do I my judgement pluck;

  And yet methinks I have astronomy,

  But not to tell of good or evil luck,

  Of plagues, of dearths, or seasons' quality;

  Nor can I fortune to brief minutes tell,

  Pointing to each his thunder, rain and wind,

  Or say with princes if it shall go well

  By oft predict that I in heaven find:

  But from thine eyes my knowledge I derive,

  And constant stars in them I read such art

  As 'Truth and beauty shall together thrive,

  If from thyself, to store thou wouldst convert';

    Or else of thee this I prognosticate:

    'Thy end is truth's and beauty's doom and date.'

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The volta is the or else the the beginning of the closing couplet.