This family of gods is more human and living to us than that of Ra or than any other set of Egyptian deities. It was also more taken up in other lands, when the gods of older peoples began to find acceptance in the West. We see with special clearness in this case the operation of the principle according to which the contrast of light and darkness when represented in the gods passes into that of moral good and evil, so that the god of light becomes the great upholder of righteousness and dispenser of beneficence. The good god of Egyptian religion, moreover, is accompanied by a goddess who is somewhat more than the pale reflection of the male god, as most Egyptian goddesses are. The incidents of the legend also lend to the divine characters a tragic depth in which the prosperous and happy gods of Egypt do not generally share.
Ptah is the god of Memphis, and adjoining his temple is the chapel of the bull Apis, who is called the "second life of Ptah." If these two resided side by side, some theory of their relationship was needed, and the bull became the earthly representative of the unseen deity. Each had a worship of prehistoric antiquity, and it is vain to theorise on their original relation to each other. As for Ptah, his name means "he who forms," and the Greeks called him by the name of their own Hephaistos, the artificer. In later times he came to be identified with the sun, and was called the "honourable," "golden," "beautiful," and "of comely face"; but earlier he seems rather to have to do with the hidden source of the world's heat, the elemental warmth which is at the beginning of all life. He also is, like Ra and Osiris, a god of the under-world to which men go after death. He is said to open the mouth of the dead--that is to say, that he hears them and judges them. But in the upper-world too he has to do with justice; he is called the "Lord of the Ell," a title connecting him with measurements and boundaries, matters of the greatest importance in Egypt. His son is Imhotep, he who comes in peace; the Greeks regarded this god as a physician, and called him Asclepios. The goddess of the triad is Sechet, who was also worshipped at Bubastis under the name of Bast, and whose symbol is a cat. Ptah, it will be seen, is a less distinct figure than either Osiris or Ra, and he very readily passes into combinations with other gods. Ptah-Sokari and Ptah-Sokar-Osiris are found much more frequently than Ptah alone.