Grant Jeffrey's "The Signature of God" sets out to prove that the Bible is the inspired word of God, passed down through the generations by the writings of Old and New Testament prophets. The majority of open-minded readers will agree that he succeeds. "The Signature of God" attempts to prove the Bible as God's word by building a foundation of arguments based on historical documents, archeological discoveries, scientific knowledge, fulfillment of Bible prophecy, and other such evidences. Those who are not Christian or Jewish (and many of those who are) will find a tremendous amount of information they either didn't know or never before viewed in the way Jeffrey presents. The author explores the advanced medical knowledge set down in the Torah, where God instructs the Jewish people to undertake certain precautions in dealing with sick people, dead animals, and other sources of infectious disease. Long before modern science uncovered bacteria and virus, God gave the Jewish nation a means to avoid them. The book also delves into the Bible codes, without citing many of the speculative and statistically insignificant ones espoused by "Bible Code" author Michael Drosnin. Recently, many academic institutions have been exploring these "codes", equidistant letter sequences in the text of the Old Testament books that make up the Torah. Jeffrey points out many of these codes, such as the name "Yeshua" (translated "Jesus") appearing an ordinate and statistically significant number of times within the Old Testament. In addition, Jeffrey devotes a chapter to the subject of mathematics and the Bible, a subject rarely touched on in modern literature. He catalogues the work of Ivan Panin, a Harvard mathematician who uncovered a series of alphanumeric codes in the Bible (over 30 separate codes involving the number 7 alone in the first sentence of the Bible)! Jeffrey quite adeptly weaves his arguments together into a cohesive and formidable argument on behalf of divine authorship of the Bible, and this is a book both believers and non-believers in God will enjoy perusing. Highly recommended, one of the best modern books (written in layman's terms) on the source and history of the Bible.