"There is a science of Dynamics in man's fortunes and nature, as well as of Mechanics. There is a science which treats of, and practically addresses, the primary, unmodified forces and energies of man, the mysterious springs of Love, and Fear, and Wonder, of Enthusiasm, Poetry, Religion, all which have a truly vital and infinite character; as well as a science which practically addresses the finite, modified developments of these, when they take the shape of immediate “motives,” as hope of reward, or as fear of punishment."