אתיקה, חלק V, משפט 25

The third kind of knowledge proceeds from an adequate idea of certain attributes of God to an adequate knowledge of the essence of things (see its definition II. xl. note. ii.); and, in proportion as we understand things more in this way, we better understand God (by the last Prop.); therefore (IV. xxviii.) the highest virtue of the mind, that is (IV. Def. viii.) the power, or nature, or (III. vii.) highest endeavour of the mind, is to understand things by the third kind of knowledge. Q.E.D.