In those days Elves and Men were of like stature and strength of body, but the Elves had greater wisdom, and skill, and beauty; and those who had dwelt in Valinor and looked upon the Powers as much surpassed the Dark Elves in these things as they in turn surpassed the people of mortal race. Only to the realm of Doriath, whose queen Melian was of the kindred of Valar, did the Sindar come near to match the Calaquendi of the Blessed Realm. (...)
Great power Melian lent to Thingol, who was himself great among the Eldar; for he alone of all the Sindar had seen with his own eyes the Trees in the day of their flowering, and king though he was of Amanyar, he was not accounted among the Moriquendi, but with the Elves of the Light [Calaquendi], mighty upon Middle-earth. (...)
The Noldor, outnumbered and taken at unawares [by Morgoth's host], were yet swiftly victorious; for the light of Aman was not yet dimmed in their eyes, and they were strong and swift, and deadly in anger, and their swords were long and terrible. (...)
Nonetheless the Edain of old learned swiftly of the Eldar all such art and knowledge as they could receive, and their sons increased in wisdom and skill, until they far surpassed all others of Mankind, who dwelt still east of the mountains and had not seen the Eldar, nor looked upon the faces that had beheld the Light of Valinor.
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Silmarillion