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“But, in one way or another, all our experiences are chemically conditioned, and if we imagine that some of them are purely ‘spiritualâ€�, purely ‘intellectualâ€�, purely ‘aestheticâ€�, it is merely because we have never troubled to investigate the internal chemical environment at the moment of their occurrence. Furthermore, it is a matter of historical record that most contemplatives worked systematically to modify their body chemistry, with a view to creating the internal conditions favorable to spiritual insight.”