Grumpy again

First day of classes  L  Today’s sonnet:

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CXXXIX

  O! call not me to justify the wrong

  That thy unkindness lays upon my heart;

  Wound me not with thine eye, but with thy tongue:

  Use power with power, and slay me not by art,

  Tell me thou lov'st elsewhere; but in my sight,

  Dear heart, forbear to glance thine eye aside:

  What need'st thou wound with cunning, when thy might

  Is more than my o'erpress'd defence can bide?

  Let me excuse thee: ah! my love well knows

  Her pretty looks have been mine enemies;

  And therefore from my face she turns my foes,

  That they elsewhere might dart their injuries:

    Yet do not so; but since I am near slain,

    Kill me outright with looks, and rid my pain.

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The but in line 3, the not in line 4, the but in line 5, the when in line 6 … are turns (great and small).  The main volta is the conveniently marked yet at the beginning of the closing couplet.  Another sonnet tomorrow.