Energeticism

Energeticism is the ontology, or philosophy of being, which holds that all things are ultimately composed of energy. It is opposed to ontological materialism and idealism. Energeticism is typically associated with the physicist and philosopher Ernst Mach. It is a theory that is largely rejected now, due to its Aristotelian metaphysical leanings, and due to its rejection of the existence of a micro-world (such as the one that chemists or physicists have discovered).

According to David Skrbina, energeticism is the ontological view held by physicists Albert Einstein and Werner Heisenberg, and by philosophers Bertrand Russell and Karl Popper.