Letters 78.26

For surfeit of self can never seize upon a life that surveys all the things which are manifold, great, divine; only idle leisure is wont to make men hate their lives. To one who roams through the universe, the truth can never pall; it will be the untruths that will cloy.

Seneca, Letters to Lucilius 78.26, translated by Richard Mott Gummere