Exloring Life Eternal

By Vincent Donovan
He was among the spread the Word among the Maasai as a (RC) Christian Missionary. A wide variety of Christians have been inspired by this work & it is considered, truly a classic.
Christianity Rediscovered, 2003 = 25th anniversary edition.

http://store.wmepress.org/chrebyvido.html
http://www.amazon.com also has a few good reviews of the book:
ISBN: 1570754624

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I have not yet read it, but have not heard any negative comments about it.