Rome was not built in a day.

What it means

Large or good things take time to build, so impatience with slow progress is misplaced. It is used to defend a timescale — either your own or someone else’s — and carries no suggestion that the work is going badly, only that it is not finished.

Where it comes from

An English rendering of the medieval French “Rome ne fut pas faite toute en un jour”, recorded in the collection “Li Proverbe au Vilain” around 1190. It appears in English in John Heywood’s proverb dialogue of about 1538, and Elizabeth I used the idea in Latin at Cambridge in 1563.

Example sentences

• “The team has only been together a term; Rome wasn’t built in a day.”
• “Give the new process a year before you judge it. Rome wasn’t built in a day.”
• “I know you wanted it live by now, but Rome wasn’t built in a day.”

When it fits — and when it does not

Reassuring from someone doing the work, evasive from someone who owes you a deadline. Both “was not” and “wasn’t” are standard; the older form “in one day” is now rare.

Similar phrases

• Good things come to those who wait.
• Slow and steady wins the race.