### The Source of Causality

The source of causality is matter and energy. All events which are actions and reactions which are relationships among people/things which are matter require energy. The concept of energy requires the principle that no person or thing is moved or changed nor any event caused without energy. Gods and goddesses, and demons and demonnesses, if they exist, must use energy to cause effects as movement and change among people/things/events.
First Law of Thermodynamics: Matter and energy cannot be destroyed, only changed in form. Matter and energy were never created: they have always existed, exist now, and always will exist. [1]
Matter can be converted into energy and energy can be converted into matter. Confirmed/verified by Dr. Albert Einstein's E = mc2 [originally m = E/c2] where E = energy, m = mass, and c2 = the speed of light [186,000 miles per second] squared [c x c = 186,000mi./sec. x 186,000mi./sec.]. [2]
Causality consists of chains of causes-and-effects leading back to the source of causality.
The source of causality was not caused but has always existed in the past, exists now in the present, and is expected to exist in the future. To ask what caused the source of causality only indicates that the person asking the question does not understand the concept of the source of causality and the related principle that the source of causality causes causality but is not caused and is therefore not an effect. Whereas chains of causes-and-effects lead back to the source of causality, the source of causality is the beginning and the end of all chains of causality. To think that all people/things/events including the source of causality have causes would require asking the question of what caused the source of causality. This question is irrational because the source of causality cannot be caused—it is what causes all causes that cause effects. This assertion is not an opinion but is an awareness the fact which is the principle that the source of causality is the beginning and end of all causal sequences.  Therefore, the substance of causality—matter/energy--is not caused but instead causes people/things/events which are forms of matter/energy.
Question: How can a thing/event cause other things/events without itself being caused?
Answer: The nature of matter/energy causes causality: matter/energy can cause effects, has caused effects, and will cause effects.
Matter/energy consists of elementary particles and their related energy, which cause subatomic particles (electrons, protons, neutrons, etc.), which cause atoms, which cause molecules, which cause inorganic and organic things/events. Elementary particles whizzing around and crashing into other elementary particles can cause subatomic particles which can whiz around and cause atoms which can combine to cause molecules which can combine to cause other things and events. The fact that all this happens is not a mystery: how it happens is the subject of science, and those explanations of how it happens which are mysterious now may not be mysterious in the future.
Matter/energy is real—it is the source of causality.

Bibliography:

[1] The First Law of Thermodynamics [the study of heat]: Matter and energy are the “stuff” of which all things and events of reality are made. Matter and energy cannot be destroyed but only changed in form. Matter can be changed into energy and energy can be changed into matter. Matter and energy are therefore eternal—without beginning nor end.
The First Law of Thermodynamics was proven by Dr. Albert Einstein by E = mc2 [E = Energy; m = mass; c = the speed of light; c2 = the speed of light squared] and m = E/c2 [Einstein’s original equation], which state that matter can be converted into energy (the process of fission: atomic bombs, nuclear energy), and energy can be converted into matter (the process of fusion: hydrogen bombs).

On the First Law of Thermodynamics:
Alan Isaacs, John Daintith and Elizabeth Martin, eds.
Concise Science Dictionary.
Oxford University Press, Oxford, England, New York, NY U.S.A.
p. 691.

Siegfried Mandel, ed.
Dictionary of Science.
Dell Publishing Co., Inc., 1 Dag Hammarskjold Plaza, New York, NY 10017, 1975.
p. 333.

[2] On Dr. Albert Einstein and the Theory of Relativity, and E = mc2:

Albert Einstein, translated by Robert W. Lawson.
Relativity: The Special and General Theory.
Crown Publishers, Inc., New York, NY, 1961.
pp. 45-48.

Charles Proteus Steinmetz.
Four Lectures on Relativity and Space.
Dover Publications, inc., 180 Varick Street, New York, NY 10014, originally published by the McGraw-Hill Book Company, Inc., 1923.
pp. 8, 44.

Jeremy Bernstein.
Einstein.
Penguin Books, 625 Madison Avenue, New York, NY 10022, U.S.A, 1976.
pp. 97-98.