2nd Speech Arg 6 History or Revelation?

This video addresses the argument that we can only prove fulfillment of prophecy by history and not by divine revelation. The correct name for the source I quoted is "George Eldon Ladd". (Couldn't think of the first name at the time", but he is the one where I first read the statement, "redemptive revelatory history". (history spoken by divine revelation versus secular history only.