I would recommend NOT getting Metzger's book as he was quite liberal in his theology...to the point of not even considering the original inspired documents to be inerrant.

I would recommend "

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Larry Bray
Elder - Reformed Presbyterian Church of Boothwyn, PCA
Boothwyn, PA - http://www.rpcb.org/
Free Online Reformed Seminary - http://www.tnars.net
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Christian ritual costs nothing and is worth nothing. True Christian religion costs all that we have and is worth everything.