CASSIUS: Did Cicero say anything?
CASCA: Ay, he spoke Greek.
CASSIUS: To what effect?
CASCA Nay, an I tell you that, I’ll ne’er look you i’ th’ face again. But those that understood him smiled at one another and shook their heads. But for mine own part, it was Greek to me.
William Shakespeare (1564-1616) English dramatist and poet
Julius Caesar, Act 1, sc. 2, l. 289ff (1.2.289-295) (1599)
(Source)
Not origin, but likely popularizer of the phrase, "It's Greek to me." Similar phrases had been around since Roman days, and through the Medieval period. Many languages/cultures have similar idioms.
Quotations about:
foreign language
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It is at school […] that he learns of the importance attached by the French nation to pens, ink, and paper. “Have you pens, ink, and paper?” is the first question asked by one Frenchman of another on their meeting. The other fellow has not any of them, as a rule, but says that the uncle of his brother has got them all three. The first fellow doesn’t appear to care a hang about the uncle of the other fellow’s brother; what he wants to know now is, has the neighbor of the other fellow’s mother got ’em? “The neighbor of my mother has no pens, no ink, and no paper,” replies the other man, beginning to get wild. “Has the child of thy female gardener some pens, some ink, or some paper?” He has him there. After worrying enough about these wretched inks, pens, and paper to make everybody miserable, it turns out that the child of his own female gardener hasn’t any. Such a discovery would shut up any one but a French exercise man. It has no effect at all, though, on this shameless creature. He never thinks of apologizing, but says his aunt has some mustard.
Jerome K. Jerome (1859-1927) English writer, humorist [Jerome Klapka Jerome]
Idle Thoughts of an Idle Fellow, “On Memory” (1886)
(Source)
First published in Home Chimes (1885-09-26).


