A hot-tempered mind is naturally most prone to anger. Just as there are four elements — fire, air, earth, and water — there are also four corresponding powers: hot, cold, dry, and moist. The way these elements mix together creates all the differences we see in places, animals, bodies, and personalities. Our own dispositions lean toward one or another of these depending on which element is strongest in us. That's why we describe some regions as wet or dry, warm or cold.
A hot mind is naturally the most prone to anger: for as there are four elements,[8] consisting of fire, air, earth, and water, so there are powers corresponding and equivalent to each of these, namely, hot, cold, dry, and moist. Now the mixture of the elements is the cause of the diversities of lands and of animals, of bodies and of character, and our dispositions incline to one or the other of these according as the strength of each element prevails in us. Hence it is that we call some regions wet or dry, warm or cold.