This appears in his dialogue On Oratory, and the attribution of the modern version of the direct quote to him is a bit of a misattribution because he doesn't say it (ironically) in so few words.
The parent I responded to gave the exact Pascal quote, but it has been given in many forms by many writers, all of whom had likely read quite a bit of Cicero.
Martin Luther also talked the same way about his sermons far earlier than Pascal.
The well-known Shakespeare quote, "Brevity is the soul of wit" is also another (loose) translation of a passage from On Oratory.
The parent I responded to gave the exact Pascal quote, but it has been given in many forms by many writers, all of whom had likely read quite a bit of Cicero.
Martin Luther also talked the same way about his sermons far earlier than Pascal.
The well-known Shakespeare quote, "Brevity is the soul of wit" is also another (loose) translation of a passage from On Oratory.