--- Benjamin de Casseres, according to QuoteInvestigator. Often misattributed to various people, including Lewis Carroll and Jules de Gaultier,
From an essay by Benjamin de Casseres about the English poet Percy Bysshe Shelley in The Poetry Journal, 1916:
In the sublime war of man against Reality man has but one weapon, the imagination. The ethereal imagination is the highest form of the evolution of the transfiguring and sublimating power of images. It marks the boundary line between the mystery of matter and the mystery of spirit. It is the fine volatilized plasma of an esoteric dimension, of a world where the truths hinted at by the x-ray and radium are true for the human mind and body.
