Hebrew letters are also numbers. Scribes would copy scriptures and add up the numbers, if the total didn't match the original total they would destroy the corrupted copies, likewise with damaged/faded copies, ensuring accuracy.
Lee Stroble interviewed Charles Templeton for his book The Case for Faith (p. 14), in this interview Templeton retells a particular reason as to why he became an atheist after having been a preacher of the Gospel. He mentions having seen a photograph of a woman in Northern Africa holding her dead baby in her arms. There was a devastating drought and Templeton blamed God for the drought because God could easily cause it to rain but was simply not doing so.