Happiness in intelligent people is the rarest thing I know.

Happiness in intelligent people is the rarest thing I know.

There are some ideas so wrong that only a very intelligent person could believe in them.

There are some ideas so wrong that only a very intelligent person could believe in them.

The sum of intelligence on the planet is a constant; the population is growing.

The sum of intelligence on the planet is a constant; the population is growing.

The mind is not a vessel to be filled but a fire to be kindled.

The mind is not a vessel to be filled but a fire to be kindled.

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

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

All intelligent thoughts have already been thought; what is necessary is only to try to think them again.

All intelligent thoughts have already been thought; what is necessary is only to try to think them again.

The emotional brain responds to an event more quickly than the thinking brain.

The emotional brain responds to an event more quickly than the thinking brain.

You have to be smart. The easy days are over.

You have to be smart. The easy days are over.

Intelligence is the ability to adapt to change.

Intelligence is the ability to adapt to change.