Man is so muddled, so dependent on the things immediately before his eyes, that every day even the most submissive believer can be seen to risk the torments of the afterlife for the smallest pleasure.

Women have a genius for love; men can only learn the art indifferently.

The concept of number is the obvious distinction between the beast and man.

There is no easy method of learning difficult things. The method is to close the door, give out that you are not at home, and work.

Christianity was preached by ignorant men and believed by servants, and that is why it resembles nothing ever known.

False opinions are like false money, struck first of all by guilty men and thereafter circulated by honest people who perpetuate the crime without knowing what they are doing.

What a miserable world!--trouble if we love, and trouble if we do not love.