Man becomes man only by his intelligence, but he is man only by his heart.

Wit is educated insolence.

Mad, adj. Affected with a high degree of intellectual independence.

Genius ain't anything more than elegant common sense.

Genius is nothing but a great aptitude for patience.

A harmless hilarity and a buoyant cheerfulness are not infrequent concomitants of genius; and we are never more deceived than when we mistake gravity for greatness, solemnity for science, and pomposity for erudition.

We should take care not to make the intellect our god; it has, of course, powerful muscles, but no personality.

It's not that I'm so smart, it's just that I stay with problems longer.

Character is higher than intellect. A great soul will be strong to live as well as think.

The test of a first-rate intelligence is the ability to hold two opposed ideas in mind at the same time and still retain the ability to function.

What a distressing contrast there is between the radiant intelligence of the child and the feeble mentality of the average adult.

There is nobody so irritating as somebody with less intelligence and more sense than we have.

The invention of IQ does a great disservice to creativity in education.

The course of every intellectual, if he pursues his journey long and unflinchingly enough, ends in the obvious, from which the non-intellectuals have never stirred.

Everyone is a genius at least once a year. The real geniuses simply have their bright ideas closer together.

I'm not offended by all the dumb blonde jokes because I know I'm not dumb... and I also know that I'm not blonde.

The bookful blockhead, ignorantly read, With loads of learned lumber in his head.

If the human brain were so simple that we could understand it, we would be so simple that we couldn't.

Every true genius is bound to be naive.

I must have a prodigious quantity of mind; it takes me as much as a week sometimes to make it up.

Common sense is not so common.

I can't tell you if genius is hereditary, because heaven has granted me no offspring.

Genius is more often found in a cracked pot than in a whole one.

I not only use all the brains that I have, but all that I can borrow.