"I command thee, my Son, to carefully engrave in thy memory all that I say unto thee, in order that it may never leave thee. If thou dost not intend to use for a good purpose the secrets which I here teach thee, I command thee rather to cast this Testament into the fire, than to abuse the power thou wilt have of constraining the Spirits, for I warn thee that the beneficent Angels, wearied and fatigued by thine illicit demands, would to thy sorrow execute the commands of God, as well as to that of all such who, with evil intent, would abuse those secrets which He hath given and revealed unto me.
Think not, however, O my Son, that it would not be permitted thee to profit by the good fortune and happiness which the Divine Spirits can bring thee; on the contrary, it gives them great pleasure to render service to Man for whom many of these Spirits have great liking and affinity, God having destined them for the preservation and guidance of those Terrestrial things which are submitted to the power of Man...
Furthermore, I wish to make thee understand that God hath destined to each one of us a Spirit, which watches over us and takes care of our preservation; these are called Genii..."
The Key of Solomon the King