Most striking at first is the appearance of sudden illumination, a manifest sign of long unconscious prior work.

Point set topology is a disease from which the human race will soon recover.

It is by logic that we prove, but by intuition that we discover. To know how to criticize is good, to know how to create is better.

There are no solved problems; there are only problems that are more or less solved.

The scientist does not study nature because it is useful; he studies it because he delights in it, and he delights in it because it is beautiful.

Doubt everything or believe everything: these are two equally convenient strategies. With either we dispense with the need for reflection.

If nature were not beautiful, it would not be worth knowing, and if nature were not worth knowing, life would not be worth living

It is through science that we prove, but through intuition that we discover.

Geometry is the art of correct reasoning from incorrectly drawn figures.

One geometry cannot be more true than another; it can only be more convenient.

It is far better to foresee even without certainty than not to foresee at all.

You don't need anybody to tell you who you are or what you are. You are what you are!

If yourhands are tied towardsanyone who's in need ofa helping hand, let yourtangue also be tied

It is time that we had uncommon schools, that we did not leave off our education when we begin to be men and women.

Nothing fruitful ever comes when plants are forced to flower in the wrong season.

Many moments in religion seem attractive to me even though I can't believe in any of it.

Beyond all our Blackberries and iPhones, we're dangerously separated from our food and water supplies.

I'm a romantic; you have to be to marry four times.

I'm always aware of mortality.

A friend in need is a friend to be avoided.

Some of the jam we thought was for tomorrow, we've already eaten