“Depart to Damascus. In that city the Pestilence has appeared. Go thither thou, to heal and to save. In this casket are stored the surest antidotes to the poison of the plague. Of that essence, undiluted and pure, which tempts to the undue prolongation of soul in the prison of flesh, this casket contains not a drop. I curse not my friend with so mournful a boon. Thou hast learned enough of my art to know by what simples the health of the temperate is easily restored to its balance, and their path to the grave smoothed from pain. Not more should Man covet from Nature for the solace and weal of the body. Nobler gifts far than aught for the body this casket contains. Herein are the essences which quicken the life of those duplicate senses that lie dormant and coiled in their chrysalis web, awaiting the wings of a future development,--the senses by which we can see, though not with the eye, and hear, but not by the ear. Herein are the links between Man’s mind and Nature’s; herein are secrets more precious even than these,--those extracts of light which enable the Soul to distinguish itself from the Mind, and discriminate the spiritual life, not more from life carnal than life intellectual. Where thou seest some noble intellect, studious of Nature, intent upon Truth, yet ignoring the fact that all animal life has a mind and Man alone on the earth ever asked, and has asked, from the hour his step trod the earth, and his eye sought the Heaven, ‘Have I not a soul; can it perish?’--there, such aids to the soul, in the innermost vision vouchsafed to the mind, thou mayst lawfully use. But the treasures contained in this casket are like all which a mortal can win from the mines he explores,--good or ill in their uses as they pass to the hands of the good or the evil. Thou wilt never confide them but to those who will not abuse! and even then, thou art an adept too versed in the mysteries of Nature not to discriminate between the powers that may serve the good to good ends, and the powers that may tempt the good--where less wise than experience has made thee and me--to the ends that are evil; and not even to thy friend the most virtuous--if less proof against passion than thou and I have become--wilt thou confide such contents of the casket as may work on the fancy, to deafen the conscience and imperil the soul.”