“He who postpones the hour of living rightly is like the rustic who waits for the river to run out before he crosses.”
Book I, epistle ii, lines 41–42
Epistles (c. 20 BC and 14 BC)
Original: (la) Qui recte vivendi prorogat horam,
Rusticus exspectat dum defluat amnis.
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Horace 92
Roman lyric poet -65–-8 BCRelated quotes

Conversation with Jean Martet (18 December 1927), Ch. 11, p. 167.
Clemenceau, The Events of His Life (1930)
Context: A man who waits to believe in action before acting is anything you like, but he’s not a man of action. It is as if a tennis player before returning a ball stopped to think about his views of the physical and mental advantages of tennis. You must act as you breathe.

Kaka on Steven Gerrard http://uk.reuters.com/article/2007/05/15/uk-soccer-champions-kaka-idUKL1540342020070515, (May 2006)
Source: Flowers for Algernon

“TV makes it so easy to postpone living for another half hour.”
Source: The Age of Missing Information

The Art of Poetry on a New Plan (1761), vol. ii. p. 147.
The saying "he who fights and runs away may live to fight another day" dates at least as far back as Menander (ca. 341–290 B.C.), Gnomai Monostichoi, aphorism #45: ἀνήρ ὁ ϕɛύγων καὶ ράλίν μαχήɛṯαί (a man who flees will fight again). The Attic Nights (book 17, ch. 21) of Aulus Gellius (ca. 125–180 A.D.) indicates it was already widespread in the second century: "...the orator Demosthenes sought safety in flight from the battlefield, and when he was bitterly taunted with his flight, he jestingly replied in the well-known verse: The man who runs away will fight again".