The real voyage of discovery consists not in seeing new landscapes, but in having new eyes.
Source: La Prisonniere (The Captive), vol. 5 of A la recherche du temps perdu, Marcel Proust, 1923
Genuinely Proust in substance, but this popular English form is a compression, not a translation. The original runs closer to: 'The only true voyage of discovery, the only fountain of Eternal Youth, would be not to visit strange lands but to possess other eyes, to behold the universe through the eyes of another, of a hundred others...' ('Le seul veritable voyage... ce ne serait pas d'aller vers de nouveaux paysages, mais d'avoir d'autres yeux'). Source is real and datable; the recorded wording should be understood as a paraphrase.