Had Poincaré been as strong in practical science as he was in theoretical he might have made a fourth with the incomparable three, Archimedes, Newton, and Gauss.

I have always hated machinery, and the only machine I ever understood was a wheelbarrow, and that but imperfectly.

Nevertheless, the consuming hunger of the uncritical mind for what it imagines to be certainty or finality impels it to feast upon shadows in the prevailing famine of substance.

Euclid taught me that without assumptions there is no proof. Therefore, in any argument, examine the assumptions.

Obvious is the most dangerous word in mathematics.

The mistakes and unresolved difficulties of the past in mathematics have always been the opportunities of its future...

The only royal road to elementary geometry is ingenuity.

Even stranger things have happened; and perhaps the strangest of all is the marvel that mathematics should be possible to a race akin to the apes.

It is the perennial youthfulness of mathematics itself which marks it off with a disconcerting immortality from the other sciences.

The very basis of creative work is irreverence! The very basis of creative work is bold experimentation. There has never been a creator of lasting importance who has not also been an innovator.

The longer mathematics lives the more abstract - and therefore, possibly also the more practical - it becomes.

A book is a mirror: if an ape looks into it an apostle is hardly likely to look out.

The Law of God was never a ladder for unsaved people to climb up to heaven. It was always a pattern of life for God’s people who had been saved from judgment by the blood of the Lamb.

There is no reason we should expect young children to enter the nocturnal darkness of sleep and dreams without help.

When I come to work each day, whether as a commentator for TheStreet.com or a host of Mad Money With Jim Cramer, I have only one thought in mind: helping people with their money.

Class is entirely intangible, and the way it affects things isn't subject to scientific analysis, and it's not supposed to be real but it's pervasive and powerful. See; just like magic.

What was it that drew you back? My marvellous personality, I suppose? Or my sparkling conversation?

Maturity comes from obedience, not necessarily from age.

Research is a passion with me; it drives me; it is my relentless master.

In England, we have such good manners that if someone says something impolite, the police will get involved.

If he raced his pregnant wife he'd finish third.