“The wealth of material that is available for determining the wording of the original New Testament is staggering: more than fifty-seven hundred Greek New Testament manuscripts, as many as twenty thousand versions, and more than one million quotations by patristic writers. In comparison with the aver- age ancient Greek author, the New Testament copies are well over a thousand times more plentiful. If the average-sized manuscript were two and one-half inches thick, all the copies of the works of an average Greek author would stack up four feet high, while the copies of the New Testament would stack up to over a mile high! This is indeed an embarrassment of riches.” – Dan Wallace
Explore the evidence for the reliability of the NT further here.
Think Christianly with Jonathan Morrow