The causes of this difference of wits, are in the passions; and the difference of passions proceedeth, partly from the different constitution of the body, and partly from different education. For if the difference proceeded from the temper of the brain, and the organs of sense, either exterior or interior, there would be no less difference of men in their sight, hearing, or other senses, than in their fancies and discretions. It proceeds therefore from the passions; which are different, not only from the difference of men’s complexions; but also from their difference of customs, and education.

The passions that most of all cause the difference of wit, are principally, the more or less desire of power, of riches, of knowledge, and of honour. All which may be reduced to the first, that is, desire of power. For riches, knowledge, and honour, are but several sorts of power.