Blake

"If the doors of perception were cleansed every thing would appear to man as it is, infinite. For man has closed himself up, till he sees all things thru' narrow chinks of his cavern. [...] This I shall do by printing in the infernal method by corrosives, which in Hell are salutary and medicinal, melting apparent surfaces away, and displaying the infinite which was hid."

William Blake, in "The Marriage of Heaven and Hell"