Each temple has its own priest to represent the king in daily religious ceremonies. The Pharaoh should be the only celebrant in daily religious ceremonies performed in different temples throughout Egypt. In reality, the high priest also played that role. A priest, like the king, needed education in art and science. Reading, writing, engineering, arithmetic, geometry, astronomy, space measurement, time calculations, were all part of this learning. The priests of Heliopolis, for example, became guardians of sacred knowledge and were seen as wise men.