Pascal's Pensées

If we must not act save on a certainty, we ought not to act on religion, for it is not certain. But how many things we do on an uncertainty, sea voyages, battles! I say then we must do nothing at all, for nothing is certain, and that there is more certainty in religion than there is as to whether we may see to-morrow; for it is not certain that we may see to-morrow, and it is certainly possible that we may not see it. We cannot say as much about religion. It is not certain that it is; but who will venture to say that it is certainly possible that it is not? Now when we work for to-morrow, and so on an uncertainty, we act reasonably; for we ought to work for an uncertainty according to the doctrine of chance which was demonstrated above.

Saint Augustine has seen that we work for an uncertainty, on sea, in battle, etc. But he has not seen the doctrine of chance which proves that we should do so. Montaigne has seen that we are shocked at a fool, and that habit is all-powerful; but he has not seen the reason of this effect.

All these persons have seen the effects, but they have not seen the causes. They are, in comparison with those who have discovered the causes, as those who have only eyes are in comparison with those who have intellect. For the effects are perceptible by sense, and the causes are visible only to the intellect. And although these effects are seen by the mind, this mind is, in comparison with the mind which sees the causes, as the bodily senses are in comparison with the intellect.