By means of this calendar, the Aztec priests kept their own records, regulated the festivals and seasons of sacrifice, and made all their astrological calculations.51 The false science of astrology is natural to a state of society partially civilized, where the mind, impatient of the slow and cautious examination by which alone it can arrive at truth, launches at once into the regions of speculation, and rashly attempts to lift the veil—the impenetrable veil—which is drawn around the mysteries of nature. It is the characteristic of true science to discern the impassable, but not very obvious, limits which divide the province of reason from that of speculation. Such knowledge comes tardily. How many ages have rolled away, in which powers that, rightly directed, might have revealed the great laws of nature, have been wasted in brilliant but barren reveries on alchemy and astrology!
The latter is more particularly the study of a primitive age; when the mind, incapable of arriving at the stupendous fact that the myriads of minute lights glowing in the firmament are the centres of systems as glorious as our own, is naturally led to speculate on their probable uses, and to connect them in some way or other with man, for whose convenience every other object in the universe seems to have been created. As the eye of the simple child of nature watches, through the long nights, the stately march of the heavenly bodies, and sees the bright hosts coming up, one after another, and changing with the changing seasons of the year, he naturally associates them with those seasons, as the periods over which they hold a mysterious influence. In the same manner, he connects their appearance with any interesting event of the time, and explores, in their flaming characters, the destinies of the new-born infant.52 Such is the origin of astrology, the false lights of which have continued from the earliest ages to dazzle and bewilder mankind, till they have faded away in the superior illumination of a comparatively recent period.