You are correct. Many are not ready for that lesson. They don't believe in the spiritual realm let alone how to BE there. They don't understand how Saul used a witch to call up Samuel after he died or how Saul only received a prophecy that he and his sons would join Samuel in paradise in three days. Entering the spirit realm is the act of a mature child of God. Maturity is a must else one can find themselves in serious danger. Do not play with necromancers.
So you are saying that ghosts are real?