Elminster: The Making of a Mage — Ed Greenwood

In ancient days, sorcerers sought to learn the One True Spell that would give them power over all the world and understanding of all magic... . The One True Spell was a woman, and her name was Mystra --and her kisses were wonderful.
Priest Halivon Tharnstar
Tales Told to a Blind Wizard

It is the time before Myth Drannor, when the Heartlands are home to barbarians, and wicked dragons rule the skies. In these ancient days, Elminster is but a shepherd boy, dreaming of adventure and heroics. When a dragon-riding magelord sweeps down upon him, though, the boy is thrust into a world of harsh realities, corrupt rulers, and evil sorcerers.

With patience and grit, Elminster sets about to change all that. The result of his labors is a world reborn and a mage made.