Pascal on ennui

I have often said that all the troubles of man come from his not knowing how to sit still. So passes the whole of life. We combat obstacles in order to get repose, and, when got, the repose is unbearable; for we think either of the troubles we have, or of those that threaten us; and even we felt safe on every side, ennui would of its own accord spring up from the depths of the heart where it is rooted by nature, and would fill the mind with its venom.