Yogananda on Mind and Matter

The Western day is nearing when the inner science of self-control will be found as necessary as the outer conquest of Nature. The Atomic Age will see men's minds sobered and broadened by the now scientifically indisputable truth that matter is in reality a concentrate of energy. The human mind can and must liberate within itself energies greater than those within stones and metals, lest the material atomic giant, newly unleashed, turn on the world in mindless destruction. An indirect benefit of mankind's concern over atomic bombs may be an increased practical interest in the science of yoga.

-- Paramahansa Yogananda, Autobiography of a Yogi  (p 265)