The Longer One Lives

Richard Shilleto (1809-1876), ed., Thucydidis I (Cambridge: Deighton, Bell, and Co., 1872), p. x:

But the longer one lives and reads the more one is conscious of one's ignorance, and shrinks from dogmatism.

Cf. the motto of Daniel Heinsius (1580-1655) — "Quantum est quod nescimus" ("How much there is that we don't know").

Related post: Understanding Greek.