Proof is the idol before whom the pure mathematician tortures himself.

We used to think that if we knew one, we knew two, because one and one are two. We are finding that we must learn a great deal more about 'and'.

The mathematics is not there till we put it there.

The memory should be specially taxed in youth, since it is then that it is strongest and most tenacious. But in choosing the things that should be committed to memory the utmost care and forethought must be exercised; as lessons well learnt in youth are never forgotten.

Compassion is the basis of all morality.

The desire to take medicine is perhaps the greatest feature which distinguishes man from animals.