351. But together with the I's practice in using this source of power or sensing-energy, there develops the above-mentioned desire for enjoying animal organisms as food and thereby a greater and greater ability for obtaining this enjoyment. This new faculty releases itself not as "sensing", but, on the contrary, in promoting the breakdown or digestion of the organisms it wishes to enjoy. This process of breaking down is the initial manifestation of the "killing principle". This breaking down or killing function also constitutes a special kind of energy combination. I have defined this particular energy in "Livets Bog" as "gravity-energy". Its real fundamental nature is a kind of "combustion". Its manifestation in its strongest concentration is identical with physical fire. In its purest form it is the same as "solar energy". In the consciousness it gives a being that explosive strengthening of its use of force which later, in the beast of prey, enables it to overcome the resistance of those animals it desires as food. The sensation of this expression of energy in the consciousness, or the organism, is known in ordinary life as "being angry". "Gravity-energy" (fire or sun energy) is thus the second of the I's great sources of power.