Why it is that we Should Not Seek Psychic Abilities, or Approach the Spiritual World, other than by Seeking the Lord

It is against sound spiritual principle to seek out (as an end-in-themselves) psychic abilities or to patronize dead spirits, gods, and so on. The spirits appealed to may be on the good or the bad side, but either way they are tainted with human will and hereditary evil, and they cannot help but attach themselves to, and to manipulate our emotions. All humans have evil; only the Lord is goodness itself. Also, spirits who are willing to do this are not high spirits (angels), though some pose to be so.
Swedenborg tells that spirits who do this have no idea of the person they are attaching to anymore than the person on earth perceives the spirit. They simply desire to live through a body again, and they do so by attaching their emotional state to the emotional state of the person on earth, which is generally messy. The Lord does not allow these spirits to know they are in a body because if they did they would run wild with desire to control it, and take the will away from the person.  It is a healthy universal principle that when we seek the spiritual realm we look to and pray to the Lord alone. They Lord uses angels for his work, but it is his will that they serve, not any person or angel. Cults that seek the psychic are playing with fire and end up playing into the hands of spirits and demons who love to be adulated and worshiped. In seeking the spiritual, we do well to tether ourselves to God, and to acknowledge Him as the one source of good. Furthermore, we must approach Him with honesty, humility, and sincerity. In fact, that is the only way He can be approached. We certainly do not manipulate Him for favor. The motivation to manipulate is from the external and tainted with evil; it comes from and attracts dark things. In Buddhism, adherents are taught to never seek psychic abilities, though it is recognized that these abilities are sometimes a byproduct of spiritual development. Swedenborg adamantly advised against intentionally developing psychic abilities or petitioning spirits, even though these abilities were enormous byproducts for him.