William Shakespeare, Sonnet cxlvii
My love is as a fever, longing still
For that which longer nurseth the disease;
Feeding on that which doth preserve the ill,
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The uncertain sickly appetite to please.
My reason, the physician to my love,
Angry that his prescriptions are not kept,
Hath left me, and I desperate now approve
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Desire is death, which physic did except.
Past cure I am, now reason is past care,
And frantic mad with evermore unrest;
My thoughts and my discourse as mad men's are,
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At random from the truth vainly express'd ;
For I have sworn thee fair, and thought thee bright,
Who art as black as hell, as dark as night.