The sphinx image also has been adopted into Masonic architecture. Among the Egyptians, sphinxes were placed at the entrance of the temple to guard the mysteries, by warning those who penetrated within, that they should conceal a knowledge of them from the uninitiated. Champollion says that the sphinx became successively the symbol of each of the gods, by which Portal suggests that the priests intended to express the idea that all the gods were hidden from the people, and that the knowledge of them, guarded in the sanctuaries, was revealed to the initiates only. As a Masonic emblem, the sphinx has been adopted in its Egyptian character as a symbol of mystery, and as such often is found as a decoration sculptured in front of Masonic temples, or engraved at the head of Masonic documents. It cannot, however, be properly called an ancient, recognized symbol of the Order. Its introduction has been of comparatively recent date, and rather as a symbolic decoration than as a symbol that announces any dogma.