My reason, the physician to my love,
Angry that his prescriptions are not kept,
Hath left me,

from William Shakespeare – Sonnet 147 on Rap Genius

Meaning

Since at least Plato, reason or philosophy has been associated with a physician, who can cure the soul or the city of its moral ills

Here, the physician is fed up with the speaker insisting that a healthy diet (i.e., not obsessing over his beloved) is really not the best choice for him right now

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