But what shall I say of human reason?
Has it not even entered the heavens?
Man alone of all animals has observed the courses of the stars, their risings and settings.

By man the day, the month, the year, is determined.

He foresees the eclipses of the sun and moon, and foretells them to futurity, marking their greatness, duration, and precise time.

From the contemplation of these things the mind extracts the knowledge of the Gods--a knowledge which produces piety, with which is connected justice, and all the other virtues; from which arises a life of felicity, inferior to that of the Gods in no single particular, except in immortality, which is not absolutely necessary to happy living.

In explaining these things, I think that I have sufficiently demonstrated the superiority of man to other animated beings; from whence we should infer that neither the form and position of his limbs nor that strength of mind and understanding could possibly be the effect of chance.
LXII.