Two of my favorite epigrams:
In theory, there is no difference between theory and practice, but in practice, there is. -- Jan L. A. van de Snepsc...
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Quem recitas meus est, o Fidentine, libellus:
Sed male cum recitas, incipit esse tuus.
"The book you're reading, Fidentinus, is mine,
But when you read it that poorly, it becomes yours."
-- Martial, Epigram I.XXXVIII, ca. 81 AD