In general, according to the legend, the Pharaoh to the inventor of writing stated that for such not to be rewarded, but to be severely punished - because people, who previously developed memory by learning everything by the mouth, will now start to rely on hieroglyphs. Accordingly, and priests can become not only people with the most pumped memory, but "spargalochniki", and learning is not from mouth to mouth, but how it got... So about rocky painting is something, but morals fall and fall, and youth is dull - at least, from ancient Egypt.