There is a distinct fire symbolism in the mystic quadriga mentioned by Dio Chrysostom:
The highest god always drives his chariot round in a circle. The chariot is drawn by four horses, and the outside horse moves very quickly. He has a shining coat, bearing on it the sign of the zodiac and the constellations
CW5 ¶ 423The second horse goes more slowly and is illuminated on one side only
CW5 ¶ 423The third horse is slower still, and the fourth horse runs round himself
CW5 ¶ 423Once, however, the outside horse set the mane of the second horse on fire with his fiery breath, and the third horse drenched the fourth with streams of sweat
CW5 ¶ 423Then the horses dissolve and merge with the substance of the strongest and most fiery, which now becomes the charioteer
CW5 ¶ 423The horses represent the four elements. The catastrophe signifies world conflagration and the deluge, after which the division of God into Many ceases, and the divine One is restored
CW5 ¶ 423There can be no doubt that the quadriga is meant as an astronomical symbol of Time
CW5 ¶ 423