What may be done at any time will be done at no time.
"By the street of By-and-by one arrives at the house of Never" (Spanish).[511]
Never put off till to-morrow what you can do to-day.
"One to-day is worth ten to-morrows" (German).[512] "To-day must borrow nothing of to-morrow" (German).[513] "When God says to-day, the devil says to-morrow" (German).[514] Talleyrand used to reverse these maxims: by never doing to-day what he could put off till to-morrow he avoided committing himself prematurely.
Strike while the iron is hot.
This proverb is cosmopolitan; but
Make hay while the sun shines
is peculiar to England, and, as Trench remarks, could have had its birth only under such variable skies as ours.
Take time while time is, for time will away.
Time and tide wait for no man.