In our definitions, we grope after the spiritual by describing it as invisible. The true meaning of spiritual is real; that law which executes itself, which works without means, and which cannot be conceived as not existing.
Ralph Waldo EmersonThe lessons of science should be experimental also. The sight of a planet through a telescope is worth all the course on astronomy; the shock of the electric spark in the elbow outvalues all theories; the taste of the nitrous oxide, the firing of an artificial volcano, are better than volumes of chemistry.
Ralph Waldo Emerson