How Can We Account for Variations Between Biblical Manuscripts?

Skeptics point to variations in the most ancient manuscripts of the New Testament in an attempt to disqualify their reliability. But is this truly the case? How can we reconcile the variations? How can we be sure of what the original copies said about Jesus, even if these original manuscripts are no longer available to us? J. Warner answers these questions in this video from a stage presentation from his book, Cold-Case Christianity.