[157] And we have a witness in our favour in one portion of the heavenly system of fire, that is in the sun, who, though he is at such a distance from the earth, sends his beams down into his inmost recesses, and sometimes warms and at times even scorches the earth itself, and the air which reaches from the earth up to the heavenly sphere, though it is by nature cold; for, all those things which are removed to a distance from his rapid course, or which are in an oblique direction, one side of it only warms; but those which are near to him, or in a direct line from him, is violently burnt up. If, then, these things are so, was it not necessary that those men who were endeavouring to mount up to heaven must have been stricken with thunderbolts and burnt up, their high-minded and proud designs being unaccomplished by them?