Proposition XXVIII. The mind's highest good is the knowledge of (Deus sive Natura), and the mind's highest virtue is to know (Deus sive Natura).
The mind is not capable of understanding anything higher than (Deus sive Natura), that is a Being absolutely infinite, and without which nothing can either be or be conceived; therefore, the mind's highest utility or good is the knowledge of (Deus sive Natura).
Again, the mind is active, only in so far as it understands, and only to the same extent can it be said absolutely to act virtuously. The mind's absolute virtue is therefore to understand. Now, as we have already shown, the highest that the mind can understand is (Deus sive Natura); therefore the highest virtue of the mind is to understand or to know (Deus sive Natura). Q.E.D.