We all know that Art is not truth. Art is a lie that makes us realize truth, at least the truth that is given us to understand.

[Todos sabemos que el arte no es verdad. El arte es una mentira que no acerca a la verdad, al menos, a aquella verdad que se nos da para entendar.]

Pablo Picasso (1881-1973) Spanish painter and sculptor

“Picasso Speaks: A Statement by the Artist,” interview with Marius de Zayas, The Arts (May 1923)
    (Source)

Discussing cubism. Translated in Quote Magazine (21 Sep 1958) as "Art is not truth; art is the lie which makes us see the truth."