proverb/ʁjɛ̃ n(ə) sɛʁ də ku.ʁiʁ | il fo paʁ.tiʁ a pwɛ̃/
slow and steady wins the race; more haste, less speed
Literally, “it's no use running, one has to leave on time”. From the fable Le Lièvre et la Tortue by Jean de La Fontaine. From that same fable, see also train de sénateur.