motion* is immortal; but that which moves another and is moved by another, in ceasing to move ceases also to live. Only the self-moving, since it cannot depart from itself, never ceases to move, and is the fountain and beginning of motion to all that moves besides. Now, the beginning is unbegotten, for that which is begotten must have a beginning; but this itself cannot be begotten of anything, for if it were dependent upon something, then the begotten would not come from a beginning.† But since