203. Heat penetrates into thickness as an extending function, but does not oscillate between two poles like light. It is only the function of density, and depends upon nothing else, not upon lines or mere surfaces, but upon the living sphere. 204. Heat and light, although characters of _one_ substance, yet stand in an antagonism like thickness and line, or as indifference and difference. Heat is properly the first perfected position of the primary act, while light is only the act of positing; the latter therefore is +, the former-. Or also, gravity is the absolute position, simply = 0; light is the commencing egression of this position out of itself +-, heat the completion + 0-, and therefore the position everywhere; it will everywhere deposit, therefore it is motion, repletion of space, expansion. Light is gravity become real, or 0 become real; 0 however, rendered real, is +-. Heat is as-at the same time +-and 0, or light and gravity, material light, light that is filling. Both will also assert the antagonism of their genesis through all forms of the world. The heat seeks to destroy the line, which the light endeavours to establish; heat seeks to produce homogeneity in the Dissimilar, light to effect the reverse. Heat is slow in its motion; with it the mass of æther must continually move, or move whither it will operate; light, however, acts spiritually and rapidly, without motion of the mass, but only glides continually with the latter. Heat is not created, it is no special matter different from æther. There is no _body of heat_. 205. Heat is everywhere where the æther is, and must consequently be regarded as a sphere. Heat is not present merely in the columns of æther between the heavenly bodies, but everywhere. Therefore heat does not move itself in the direction of the line, but it extends itself on all sides, as real space. FIRE. 206. Light and heat were the first phenomena of the world. Heat with light, however, are _Fire_. Fire is the totality of æther, is God manifested in his totality. God, previous to his determination to create a world, was darkness; in the first act of creation, however, he appeared as fire. There is no higher, more perfect symbol of divinity than fire. God's whole consciousness, apart from individual thoughts, is fire. The Holy Scriptures therefore usually admit of God appearing under the form of a fire, as a fiery bush, a flame. The world is none other than a rotating globe of fire. 207. Everything that is, has originated out of fire; everything is only _cooled_, rigidified fire. As everything has become out of fire, so must everything to be annihilated have recourse to fire. If finite things be only fire singly posited, so must every change occurring in the same be an igneous change. Nothing changes in the world but fire. The essential change of things take place only by fire. RETROSPECT.