Ex. It is our instinct to eat fatty/sugary/calorie-dense foods. Those who cannot reject the instinct are obese and dumb. Those who can deny this instinct are intelligent; they treat their bodies right, even if healthy foods don't always taste the best. Ex. A dog *must* chase a tennis ball, whether he wants to or not. It is not until the instinct of tiredness overpowers the instinct to fetch the ball that the dogs stops fetching. The ability to deny instinct is intelligence.