Sneezing absorbs all the functions of the soul just as much as the [sexual] act, but we do not draw from it the same conclusions against the greatness of man, because it is involuntary; although we bring it about, we do so involuntarily. It is not for the sake of the thing in itself but for another end, and is therefore not a sign of man's weakness, or his subjection to this act.
Blaise PascalYou see, if the height of the mercury [barometer] column is less on the top of a mountain than at the foot of it (as I have many reasons for believing, although everyone who has so far written about it is of the contrary opinion), it follows that the weight of the air must be the sole cause of the phenomenon, and not that abhorrence of a vacuum, since it is obvious that at the foot of the mountain there is more air to have weight than at the summit, and we cannot possibly say that the air at the foot of the mountain has a greater aversion to empty space than at the top.
Blaise PascalOur imagination so magnifies this present existence, by the power of continual reflection on it, and so attenuates eternity, by not thinking of it at all, that we reduce an eternity to nothingness, and expand a mere nothing to an eternity; and this habit is so inveterately rooted in us that all the force of reason cannot induce us to lay it aside.
Blaise Pascal