In plain words
Powers of many kinds, those of the netherworld and the like, and what they call alchemy: even if you gain them before your eyes in this world, you who practise, let go of any hold on them within.
Word for word
Even if the practitioner directly obtains in this world various extraordinary powers and the alchemical means associated with the netherworld and the like, let inward attachment to them be relinquished.