The mathematicians know a great deal about very little and the physicists very little about a great deal. - Stanisław Ulam

In its evolution from a more primitive nervous system, the brain, as an organ with ten or more billion neurons and many more connections between them must have changed and grown as a result of many accidents.

What exactly is mathematics? Many have tried but nobody has really succeeded in defining mathematics; it is always something else.

As one sharpens a knife on a whetstone, the brain can be sharpened on dull objects of thought. Every form of assiduous thinking has its value.