I predict it will come to be seen as a turning point in the history of psychology.

The idea that thought is the same thing as language is an example of what can be called a conventional absurdity: a statement that goes against all common sense but that everyone believes because they dimly recall having heard it somewhere and because it is so pregnant with implications.

As an experimental psychologist, I have been trained not to believe anything unless it can be demonstrated in the laboratory on rats or sophomores.

According to a recent study of the brains of identical and fraternal twins, differences in the amount of gray matter in the frontal lobes are not only genetically influenced but are significantly correlated with differences in intelligence.

On the contrary, violence is often caused by a surfeit of morality and justice, at least as they are conceived in the minds of the perpetrators.

As people age, they confuse changes in themselves with changes in the world, and changes in the world with moral decline—the illusion of the good old days.

The moral value of quantification is that it treats all lives as equally valuable, so actions that bring down the highest numbers of homicides prevent the greatest amount of human tragedy.

A list of the ways in which we’re stupid can’t explain why we’re so smart: smart enough to have discovered the laws of nature, transformed the planet, lengthened and enriched our lives, and, not least, articulated the rules of rationality that we so often flout.