If Agni scared away the spirits of the night for the Aryas, they greeted with the liveliest joy the earliest light, the approach of breaking day, the first white rays of the dawn, which assured them that the night had not been victorious over the light, that the daylight was returning. These rays are for them a beautiful pair of twins, the brothers of Ushas, the morning glow, the sons of the sky.[76] They are named the two Açvins, _i.e._ the swift, the horsemen; and also Nasatyas, _i.e._ apparently, the trustworthy, or guileless. Swift spirits, they hasten on before the dawn. As they pass onward victorious against the spirits of the night, and each morning assist the earth against the darkness, they are the helpers and protectors of men. That this conception of the Açvins springs from the common possession of the parent-stock of the Indo-Europeans, is proved by the Dioscuri of the Greeks. Dioskouroi means, "the young sons of the sky," and in the myth of the Greeks they are the brothers of Helena, _i.e._ of the Bright one, the Light; and if, in this myth, they live alternately in heaven and in the gloom of the under-world, this fact is no doubt founded in the idea that the first beams which break forth from the night belong to the darkness as much as to the light. In the Rigveda, the Açvins are compared to two swans, two falcons, two deer, two buffaloes, two watchful hounds. They are invoked to harness their light cars, drawn by swan-like, falcon-like, golden-winged horses, to descend and drink the morning offering with Ushas (the [Greek: Auôs, Eôs] of the Greeks.) They heal the sick, the blind, the lame, and make the old young again, and strong; they give wealth and nourishment, they accompany ships over the wide sea, and protect them. In invocations in the Rigveda to the Açvins, in which the benefits done by them to the forefathers are extolled and enumerated, we find: "Açvins, come on your chariot which is yoked with the good horses, which flies like the falcon, and is swifter than the wind, or the thoughts of men, on which ye visit the houses of pious men; come to our dwelling. On the chariot, whose triple wheel hastens through the triple world (the Indians distinguish the heaven of light, the region of the atmosphere and the clouds, and the earth as three worlds) approach us. Make the cows full of milk, and feed our horses, and give us goodly progeny. Approach in swift, fair-coursing chariots; listen, ye bounteous, to my prayer; ye Açvins, whom the men of old extol as driving away want. The falcons, the swift-winged ones, who fly like the vultures in the sky, may they bring you, ye Nasatyas, like water streaming from heaven, to the sacrifice. In old days ye gave nourishment to Manu; ye speedily brought food to Atri in the dark dungeon, and freed him from his bonds; ye restored light to the blind Kanva, ye bounteous ones, whom we love to praise. With your onward flying horses ye brought Bhujyu