Mystra

The Lady of Mysteries, Our Lady of Spells, the Mother of All Magic
Mystra is the goddess of magic, and with that the goddess of possibilities. She is venerated by mages and by those who use magic or magical objects in their daily lives. She also receives the prayers of those who find magic wondrous or encounter magic they fear. Mystra is the goddess of the essential force that makes all spellcasting possible. She provides and tends the Weave, the conduit through which mortal spellcasters and magical crafters can safely access the raw force of magic.
The faith of Mystra is pervasive in Faerûn, which is to be expected for a land as touched by magic as it is. Her worshipers include those who use magic or work closely with it, such as alchemists and sages. The blue-clad priests of Mystran temples count wizards and sorcerers among their numbers, as well as the occasional bard. The goal of Mystra’s faithful is simple: that magic be preserved and promulgated throughout the Realms. It isn’t unusual for her followers to keep an eye out for those who demonstrate high potential for using magic and help arrange for such persons to find tutelage with a suitable mentor.