We cannot ... prove geometrical truths by arithmetic.

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.

Anyone who considers arithmetical methods of producing random digits is, of course, in a state of sin.

"Can you do addition?" the White Queen asked. "What's one and one and one and one and one and one and one and one and one and one?" "I don't know," said Alice. "I lost count."

The different branches of Arithmetic--Ambition, Distraction, Uglification, and Derision.

"Obvious" is the most dangerous word in mathematics.