''MyIshmael '' by DanielQuinn 

http://www.ishmael.org/images/english-my_ishmael.jpg
[ISBN 0553379658] Unbeknownst to the narrator of IshmaelBook, a second pupil responded to the ad in the paper ("Teacher seeks pupil. Must have an earnest desire to save the world") -- twelve-year-old Julie Gerchak, whose interaction with Ishmael results in a dialogue strikingly different from the one found in Ishmael...

More info and some excerpts can be found at http://www.ishmael.org/Origins/My_Ishmael/
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An excellent book. Less rigorous than IshmaelBook, but more entertaining. It appears to be written for the younger generation. 
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CategoryBook