We receive the germ of our human ego on Mars

 

"I am come to send fire on the earth; and what will I, if it be already kindled? But I have a baptism to be baptized with; and how am I straitened till it be accomplished!"  —Luke 12:49-50

"Rudolf Steiner:  "As man passes again through Mars existence, the lofty spirituality with which he was imbued during his first passage through the Mars sphere, and which enabled him to experience the cosmic Word, is now transformed into spiritual substance of a somewhat lower order — into that spiritual substance from out of which, later on, the human ego manifests itself. It is also during this return journey through the Mars sphere that the spirit-germ of the larynx and lung formations are added."

Source: The Rudolf Steiner Archive November 17, 1923