Whatever you encounter, either within or without, slay it at once: on meeting a buddha slay the buddha, on meeting a patriarch slay the patriarch, on meeting an arhat slay the arhat, on meeting your parents slay your parents, on meeting your kinsman slay your kinsman. Nirvana and Bodhi are dead stumps to tie your donkey to. The sacred teachings are only lists of ghosts, sheets of paper fit for wiping the pus from your boils.