In Egyptian mythology, ka (CR:5) (LH:10) (TL:10), hieroglyph: , refers what is generally translated as the "spirit", in modern terminology; this, however, likely differs significantly from the original Egyptian human model.
The following are quotes:
- “Ka is the double or the abstract personality of a man or woman. The Ka could separate itself from or unite itself to the body at will and could move freely from place to place. A dead man's Ka had to be preserved if his body was to become everlasting. Funeral offerings, such as meats, cakes, wines, and unguents, were made to the Ka, and when food was not available, offerings were painted on the walls, accompanied by the recitation of specific prayers. The tombs of the early Egyptian had special chambers in which the Ka was worshiped and received offerings, and the priesthood included a group called "priests of Ka," who performed services in honor of the Ka. According to one version of the creation myth that appears in the Pyramid Texts, after the sun god spit the gods Shu and Tefnut, he put his arms about them so that his "Ka might be in them." The Ka is closely associated with the Ba, the soul.”
- — Anthony Mercante (1978), Who’s Who in Egyptian Mythology 
- “In Memory of father Wilhelm G. Luckert, whose “restless mind harbored questions and doubts which the Karl imbibed in childhood”, and mother Emilie Luckert-Hilt (who passed while book went to print). As their lives and loves survive in memory among their offspring, their ka souls will continue to shine from the shadow play among the ba structures of this book.”
- — Karl Luckert (1991), Egyptian Light and the Hebrew Fire (pg. viii)
- Mercante, Anthony S. (1978). Who’s Who in Egyptian Mythology (editor: Robert Bianchi) (ka, pg. 81; ba, pg. 19). Metro Books, 1995.
- Luckhert, Karl. (1991). Egyptian Light and Hebrew Fire: Theological and Philosophical Roots of Christendom in Evolutionary Perspective (pg. viii). SUNY Press.
- Ka – Hmolpedia 2020.