"Intelligence is largely at the mercy of self-control: even the smartest kids still need to do their homework. [It may well be that,] raw intelligence [viz., IQ] isn’t so much the primary cause of future success but rather one of a series of causes of future success, a series that begins with capacity for self-control and capacity for delay of gratification. Rather than focusing on intelligence and whether it is mostly hereditary or can be changed, it may be more beneficial to study self-control and whether that is mostly hereditary or can be changed."