Il n'est pas certain que tout soit incertain. (Translation: It is not certain that everything is uncertain.)

How I hate this folly of not believing in the Eucharist, etc.! If the gospel be true, if Jesus Christ be God, what difficulty is there?

When a natural discourse paints a passion or an effect, one feels within oneself the truth of what one reads, which was there before, although one did not know it. Hence one is inclined to love him who makes us feel it, for he has not shown us his own riches, but ours. ...such community of intellect that we have with him necessarily inclines the heart to love.

Let a man choose what condition he will, and let him accumulate around him all the goods and gratifications seemingly calculated to make him happy in it; if that man is left at any time without occupation or amusement, and reflects on what he is, the meagre, languid felicity of his present lot will not bear him up. He will turn necessarily to gloomy anticipations of the future; and unless his occupation calls him out of himself, he is inevitably wretched.

Men are so completely fools by necessity that he is but a fool in a higher strain of folly who does not confess his foolishness.

We run carelessly to the precipice, after we have put something before us to prevent us seeing it.

The origins of disputes between philosophers is, that one class of them have undertaken to raise man by displaying his greatness, and the other to debase him by showing his miseries.