Seal No. 4 : The two pillars The two pillars – one rising out of the sea, the other out of the land. In these pillars is indicated the mystery of the part played in human evolution by red, or oxygenated blood, and blue, or carbonated blood. The human ego passes through its evolution in the earth's cycle by bringing its life to physical expression in the action and reaction upon each other and red blood, without which there would be no life, and blue blood, without which there would be no knowledge. A future state is here represented by the figure with a face which has acquired the sun's spiritual forces. At that time human beings will no longer acquire knowledge from without, but will have devoured it, as the words in the Revelation say: “And I took the little book out of the angel's hand, and ate it up…”