Deviner avant de démontrer! Ai-je besoin de rappeler que c'est ainsi que se sont faites toutes les découvertes importantes.

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.

The worst time to quit on yourself is when things are getting hard in your life.

I would encourage you: be informed - knowledge is power.

I've always said, 'I don't want to be irrelevant.'

Mindfulness is deliberately paying full attention to what is happening around you-in your body, heart and mind. Mindfulness is awareness without criticism or judgment.

Knowing reality means constructing systems of transformations that correspond, more or less adequately, to reality.

I would like to be remembered, well... the Mexicans have a phrase, 'Feo fuerte y formal'. Which means; he was ugly, strong and had dignity.

I hope Donald Trump doesn't become president of the United States and I expect the people of the United States will have the good sense not to elect him.

Go on, son, you're not doing me any good by bleeding.

Wisdom is a dreadful thing when it brings no knowledge to its possessor.

I'm tied of hearing about temperance instead of abstinence, in order to please the cocktail crowd in church congregations.