Selene
In the darkness, I light the way. The Stars are my companions. You count your month by my coming. I am the vigour of youth. I am the caution of the mother. I am the wisdom of the aged. I am above and I am below but always your guardian. I am forever at her side who is our mother. Watching the night upon the blessed Earth.
The Moon
I do not worship the moon, just as I do not worship the sun or the earth or the stars in the sky. I see these things not as physical manifestations of the Gods but as symbolic manifestations. Perhaps it is the lunar cycle, or the way the lunar cycle affects us as human beings that caused the association of moon and divinity, perhaps it was superstition about the moon, but whatever the reason, the association was made and has therefore become tradition. In Greece, the moon was associated with more than one goddess, in fact most of the Olympian Goddesses have lunar associations, but if any goddess could have been said to be the moon, it was Selene.
A Minor Deity
Selene is, for all intents and purposes, a minor deity in the Hellenic world. Her association with the moon makes her an obvious goddess, and one that all Hellenes have heard of and most have included in their invocations from time to time, but she is not a goddess that forms the center of worship, nor is she a goddess of universal influence as would be Hera or Aphrodite, but she is none the less a goddess, and due respect. Perhaps one of the things that Greek culture managed to do best was identify the goddesses of foreign lands with their own, or idnetify the goddesses of other Greek regions with more popular goddesses and gods, thus Selene, like Hekate, became very much associated and identified with the Great Goddess Artemis.
Sister of Helios
Perhaps one of the things that kept Selene from becoming a major Greek Goddess was the fact that in the genaeologies of the Gods, she was not a daughter of Zeus, but of the Titan Hyperion. She is sister of Helios, the Sun, and forms a counter point to him. Selene too is a goddess that watches us, from a distance, and like him, is likely more objective a figure than Artemis is, though there too her "far shooter" aspect lays claim to this aspect of the moon goddess as well.
Associations and Identifications
The moon is associated with a great many goddesses. Artemis was probably the most potent force for assimilation of deities in Greece, and she too was a goddess of the moon. Hekate, Selene, Iphigeneia/Iphimedeia, etc, are goddesses that are all eventually associated with Artemis as a result, and in many cases, they become identified as Artemis. Selene manages to maintain her individuality as the moon itself, and unfortunately, very little mythology of this goddess has survived into modern times.