La montaña sagrada

«The essence of the phàrmakon lies in the way in which, having no stable essence, no ‘proper’ characteristics, it is not, in any sense (metaphysical, physical, chemical, alchemical) of the word, a substance.»
«The phàrmakon is the movement, the locus, and the play: (the production of) difference. It is the differance of difference»
Jacques Derrida, Dissemination .