Non conoscendo Dio, come mai puoi
Vantarti di dottrina? essendo cieco,
De’ colori esser giudice tu vuoi.

Translation: Thou know’st not God; how, then, canst reason find To vaunt thy doctrine? ’tis as though thou ’dst claim To be a judge of colours, being blind. | Translation reported in Harbottle's Dictionary of quotations French and Italian (1904), p. 372.