Upvote:2
Sounds like something out of the Imitation of Christ:
One hath said, “As oft as I have gone among men, so oft have I returned less a man.” This is what we often experience when we have been long time in conversation. For it is easier to be altogether silent than it is not to exceed in word. It is easier to remain hidden at home than to keep sufficient guard upon thyself out of doors. He, therefore, that seeketh to reach that which is hidden and spiritual, must go with Jesus “apart from the multitude.” No man safely goeth abroad who loveth not to rest at home. No man safely talketh but he who loveth to hold his peace. No man safely ruleth but he who loveth to be subject. No man safely commandeth but he who loveth to obey.
although Thomas à Kempis (or whoever wrote Imitation of Christ), could certainly be quoting someone; although he gives a direct quote only ascribing it to "one hath said" which I'm guessing just means it's a proverb he heard somewhere. But owing to its popularity, translations and his own scholarship, I'd assume Pascal was familiar with the the text.