Secondly, he must have a great desire of discovering truth, from whence will arise that threefold production of the mind; one of which depends on knowing things, and explaining nature; the other, in defining what we ought to desire and what to avoid; the third, in judging of consequences and impossibilities, in which consists both subtlety in disputing and also clearness of judgment.

Now, with what pleasure must the mind of a wise man be affected which continually dwells in the midst of such cares and occupations as these, when he views the revolutions and motions of the whole world, and sees those innumerable stars in the heavens, which, though fixed in their places, have yet one motion in common with the whole universe, and observes the seven other stars, some higher, some lower, each maintaining their own course, while their motions, though wandering, have certain defined and appointed spaces to run through! the sight of which doubtless urged and encouraged those ancient philosophers to exercise their investigating spirit on many other things.

Hence arose an inquiry after the beginnings, and, as it were, seeds from which all things were produced and composed; what was the origin of every kind of thing, whether animate or inanimate, articulately speaking or mute; what occasioned their beginning and end, and by what alteration and change one thing was converted into another; whence the earth originated, and by what weights it was balanced; by what caverns the seas were supplied; by what gravity all things being carried down tend always to the middle of the world, which in any round body is the lowest place.
XXV.

A mind employed on such subjects, and which night and day contemplates them, contains in itself that precept of the Delphic God, so as to "know itself," and to perceive its connection with the divine reason, from whence it is filled with an insatiable joy.

For reflections on the power and nature of the Gods raise in us a desire of imitating their eternity.