all he would have needed to do to verify or refute this theory was to ask a number of men and women to open their mouths so he could count their teeth.

We cannot ... prove geometrical truths by arithmetic.

Some men are just as firmly convinced of what they think as others of what they know

Democracy is when the indigent, and not the men of property, are the rulers.

There are things which seem incredible to most men who have not studied mathematics.

The difference between a house and a home is like the difference between a man and a woman-- it might be embarrassing to explain, but it would be very unusual to get them confused.