[Footnote A: The Conservation of Energy—Stewart, pp. 44, 45. Recent
Advances in Physical Science—Tait, pp. 63, 65.]
About the same time, it was shown that light can be converted into heat; and later it was proved that electricity may be changed into heat or light. In all these cases it was found that the amount of energy changed was exactly equal to the amount of energy produced.
Thus, by countless experiments, it was finally determined that energy is indestructible; that, when any form of energy disappears, it reappears immediately in another form. This is the law of the persistence of force or energy. In more recent days, it has been suggested that all known forces are variations of a great universal force, which may or may not be known. The very nature of force or energy is not understood. In the language of Spencer, "By the persistence of force, we really mean the persistence of some cause which transcends our knowledge and conception."[A]
[Footnote A: First Principles, Spencer, 4th ed., p. 200.]
It need hardly be explained that energy cannot exist independently of matter; and that the law of the persistence of matter is necessary for the existence of the law of persistence of force.
[Sidenote: Universal intelligence, comparable to universal energy is indestructible, according to Joseph Smith.]
Joseph Smith was not a scientist; and he made no pretense of solving the scientific questions of this day. The discussion relative to the convertibility of various forms of energy was in all probability not known to him. Still, in his writings is found a doctrine which in all respects resembles that of the conservation of energy.
Joseph Smith taught, and the Church now teaches, that all space is filled with a subtle, though material substance of wonderful properties, by which all natural phenomena are controlled. This substance is known as the Holy Spirit. Its most important characteristic is intelligence. "Its inherent properties embrace all the attributes of intelligence."[A] The property of intelligence is to the Holy Spirit what energy is to the gross material of our senses.
[Footnote A: Key to Theology, P. P. Pratt, 5th ed., p. 40.]
In one of the generally accepted works of the Church, the energy of nature is actually said to be the workings of the Holy Spirit. The passage reads as follows: "Man observes a universal energy in nature—organization and disorganization succeed each other—the thunders roll through the heavens; the earth trembles and becomes broken by earthquakes; fires consume cities and forests; the waters accumulate, flow over their usual bounds, and cause destruction of life and property; the worlds perform their revolutions in space with a velocity and power incomprehensible to man, and he, covered with a veil of darkness, calls this universal energy, God, when it is the workings of his Spirit, the obedient agent of his power, the wonder-working and life-giving principle in all nature."[A]