Intelligence test scores and marks in school are not always true indicators of the worth of a student, nor even the power of his intellect.

The true test of intelligence is not how much we know how to do, but how we behave when we don't know what to do

The true sign of intelligence is not knowledge but imagination. I have no special talent. I am only passionately curious.

It is true that some percentage of bright people really do not test well, but most of the time the only thing about "common man's intelligence" that is indubitably true is that it is common. The concept of some ephemeral, elusive nonverbal intelligence simply allows one to impute intelligence to anyone who strikes your fancy. … Eliminating standardized tests allows the cognitive elite to manipulate the soft stuff in ways the less-often-washed cannot. Mount Holyoke has accomplished nothing more than replacing a tyranny of merit with a tyranny of privilege.

The true sign of intelligence is not knowledge but imagination.

Intelligence is not normally distributed.

True intellect should not appear to be intellectual.

Intelligence is not the ability to store information, but to know where to find it.

“Intelligence” demands the most strict of definitions, since the word is easily and often abused. Intelligence rates the quality of Gaean man’s competence at altering environment to suit his convenience, or, more generally, the solution of problems. The corollaries to the idea are several. Among them: In the absence of problems, intelligence cannot be measured. A creature with a large, complicated brain is not necessarily intelligent. Raw abstract intelligence is a meaningless concept.

The true sign of intelligence is creativity.

If, as I maintain and firmly believe, there is no objective definition of intelligence, and what we call intelligence is only a creation of cultural fashion and subjective prejudice, what the devil is it we test when we make use of an intelligence test?

Knowing a great deal is not the same as being smart; intelligence is not information alone but also judgement, the manner in which information is co-ordinated and used. Still, the amount of information to which we have accessed is one index of our intelligence.

True intelligence very readily conceives of an intelligence superior to its own; and this is why truly intelligent men are modest.

Historically, people have been naive about what qualities, if mechanized, would undeniably constitute intelligence. Is intelligence an ability to integrate functions symbolically? If so, then AI already exists, since symbolic integration routines outdo the best people in most cases.
If intelligence involves learning, creativity, emotional responses, a sense of beauty, a sense of self, then there is a long road ahead, and it may be that these will only be realized when we have totally duplicated a living brain.