Wisdom among men is twofold, rational and moral. Their rational wisdom is purely intellectual, their moral wisdom is both intellectual and a matter of how they live. This conclusion can be seen merely by looking at this proposition and studying it. But I shall list some particular examples, so as to make it known what is meant by men's rational wisdom and their moral wisdom.

The subjects which belong to their rational wisdom are given different names. Their generic names are knowledge, intelligence and wisdom. The more specific terms are rationality, judgment, ingenuity, learning and sagacity. But there are sciences proper to each person's occupation, so these are very numerous. There are sciences proper to the clergy, to magistrates and their various officers, to judges, to doctors and chemists, to soldiers and sailors, to craftsmen and labourers, to farmers and so on. Rational wisdom also includes all the sciences which young people learn at school, so as later to achieve intelligence. They have different names, such as philosophy, physics, geometry, mechanics, chemistry, astronomy, law, politics, ethics, history, and many more; these serve as gateways leading to rational ideas, from which rational wisdom is acquired.