Computers are useless. They can only give you answers.

[Los ordenadores son inútiles. Sólo pueden darte respuestas.]

Pablo Picasso (1881-1973) Spanish painter and sculptor

(Attributed)

The above is a later paraphrase of the original attribution, in William Fifield, "Pablo Picasso: A Composite Interview," The Paris Review (Summer/Fall 1964):

I feel I am nibbling on the edges of this world when I am capable of getting what Picasso means when he says to me -- perfectly straight-facedly -- later of the enormous new mechanical brains or calculating machines: "But they are useless. They can only give you answers." How easy and comforting to take these things for jokes -- boutades!

Fifield later included the comment from Picasso twice in his In Search of Genius (1982):

He said contemptuously: "What good are computers? They can only give you answers."
[ch. 1 "Picasso, Dali, Miro, Graves, and Others"]

I feel I am nibbling on the edges of this when I am capable of getting what Picasso means when he says to me – with a perfectly straight face – of computes: “But they are useless. They can only give you answers.” How easy and comforting to take these things for jokes!
[ch. 2 "Picasso"]

The latter quote (just the words by Picasso) was highlighted in the New York Times review of the book the following year, providing the publicity for the quotation, and versions with "Computers" substituted for "But they" become frequent thereafter.

More discussion of the quotation here: Computers Are Useless. They Can Only Give You Answers – Quote Investigator®.