Energy as a philosophical concept spans physics (the capacity to do work), vitalism (élan vital, the life-force that distinguishes living from non-living
matter), and cultural analysis. Nietzsche's will to power is a theory of energy — the fundamental drive of all living things toward expansion, intensification, and the overcoming of resistance. Blake's
declaration that "Energy is Eternal Delight" is a philosophical claim against Newtonian mechanism: energy is not a quantity to be measured but
a living, spiritual force. In thermodynamics, the concept of
entropy — the tendency of
closed systems toward maximum disorder — raises philosophical questions about time, disorder, and the ultimate fate of organized complexity. For poets, energy is both metaphorical (the vitality of the line, the poem's kinetic force) and philosophical (the claim that the poem participates in the energies of the
cosmos, not merely reflects them). Related terms: élan vital, will to power, entropy, vitalism, Blake's contraries, Pound's phanopoeia/melopoeia/logopoeia.