Know the true value of time; snatch, seize, and enjoy every moment of it. No idleness, no laziness, no procrastination: never put off till to-morrow what you can do to-day.

Lord Chesterfield (1694-1773) English statesman, wit [Philip Dormer Stanhope]

Letter (1749-12-26) to his son (#211)
    (Source)

Chesterfield either loves the "Never put off" phrase or is very familiar with it: he repeats it a few months later in Letter 216 (1750-02-05), and then a few years later in Letter 309 (1754-02-26).

See Fuller and Franklin.