seems to me the only meditation that JWs and others of their kind advocate is not much different from self hypontic techniques... playing "spiritua" messages over and over again until they are emotionally designated as TRUTHS.
zen meditation, in contrast, tells one to ignore all beliefs and comparisons that arise in the mind and just pay attention to the experience as it happens... rather than be open to demonic influences, zen tells people to treat anything mystical as a hinderance to acheiving pure awareness.