“ No profit grows where is no pleasure ta'en; in brief, sir, study what you most affect. ”
 William Shakespeare, The Taming of the Shrew (1623). copy citation

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“Balk logic with acquaintance that you have, And practise rhetoric in your common talk; Music and poesy use to quicken you; The mathematics and the metaphysics, Fall to them as you find your stomach serves you. No profit grows where is no pleasure ta'en; In brief, sir, study what you most affect. LUCENTIO. Gramercies, Tranio, well dost thou advise.
If, Biondello, thou wert come ashore, We could at once put us in readiness, And take a lodging fit to entertain Such friends as time in Padua shall beget.” source

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