When stone learned to speak.
The earliest Egyptian writing appears around 3000 BC, on small ivory tags and ceremonial palettes. Within a few centuries, the language was being carved into the walls of pyramids — the famous Pyramid Texts of King Unas, the oldest religious literature in the world.
This earliest stage, Old Egyptian, gave way around 2000 BC to Middle Egyptian — the classical form of the language, the one Egyptian schoolboys would still copy out two thousand years later as a mark of education. It is the language of Sinuhe, of the Coffin Texts, of the great wisdom literature.
Three scripts coexisted: the formal hieroglyphs for monuments, the cursive hieratic for everyday writing on papyrus, and later — much later — the rapid Demotic for ordinary commerce and letters. All three wrote the same language at different speeds, the way modern English uses print, cursive, and shorthand.