In support of this claim Hume cites various regularities that we observe in human society, where class, sex, occupation, age, and other such factors are seen to be reliably correlated with different motives and conduct (T 2.3.1.5–10/401–3). Regularities of this kind make it possible for us to draw the sorts of inferences that are needed for human social life, such as in all our reasoning concerning business, politics, war, and so on (T 2.3.1.15/405; EU 8.17–18/89–90). In the absence of necessity, so understood, we could not survive or live together.