Rome wasn't built in a day

Probably a calque of Middle French Rome ne fut pas faite toute en un jour (literally “Rome was not made all in one day”); compare modern French Rome ne s'est pas faite en un jour.

• "I know this project is a big undertaking, but you need to have patience and be hopeful. Remember that Rome wasn’t built in a day."
• "[O]ne daye or lytle tyme is not ynoughe for the acheuinge of a great matter. Which is al one with this in engliſhe: Rome was not buylt in one day."
• "Rome was not built in one day (quoth he), and yet stood / Till it was finisht, as some say, full fayre."
• "The Reformation you haue made of the many and maine corruptions of the Romiſh Ch[urch] vve do ingenuouſly acknovvledge, and doe vvithall imbrace vvith you all the truths vvhich to our knovvledge you haue receiued in ſtead of them. But Rome vvas not built all in a day."
• "[…] Rome''' vvas not built in a day, nor is a Reformation in the true Lavv-ſenſe effectable preſently; […]"
• "[Y]ou muſt lay your account vvith mounting by gradual ſteps to the ſummit of your fortune.—Rome vvas not built in a day,— […]"
• "But, "Rome wasent built in a day," nor will one thump of the pate make a soldier."
• "[T]hou must have patience. Rome was not built in a day—you cannot become used to your court-suit in a month's time, any more than when you changed your long coat for a doublet and hose; […]"
• "Rome wasn't built in a day, nor, for that matter, Templetown 'ither, though it may be said to be a quick-growing place."
• ""As Rome," it was suggested, "had not been built in a day,["] so neither had Mademoiselle Gérard Moore's education been completed in a week, or by merely wishing to be clever. It was effort that had accomplished that great work: […]"
• "Rome wasn't built in a day and the path of black and white relationships in the South won't be solved overnight, either."
• "One fine day / We'll fly away / Don't you know that Rome wasn't built in a day?"
• "I feel like Rome wasn't built in a day, and I know that everybody is really impatient, but I know that with time things can be turned around."
• "I actually believe in some respects we may be in danger of working too quickly, simply to address that perception. As the ridiculously over-used cliché notes, Rome was not built in a day. What I do accept is that the 100-day project that saw the new city plan designed was done at breakneck speed. This was a phenomenally challenging time frame but absolutely crucial. For a community still suffering, still shocked, and literally still shaking, there clearly needed to be a plan put in place as quickly as possible."

• Rome wasn't burned in a day

• a journey of a thousand miles begins with a single step
• all roads lead to Rome
• eat an elephant one bite at a time
• haste makes waste
• more haste, less speed
• slow and steady wins the race