Meditation is for sane and healthy people. Each person who wants to practice meditation must try to purify his whole nature because whatever glamors, illusions, negative feelings, bad intentions, and low motives exist in him will be stimulated by meditation.
A person must first purify himself, then invoke energy through meditation and proceed slowly, observing the results.
Sometimes when people begin to practice meditation, they become worse than before. Hidden “germs” and “weeds” in their physical, emotional, and mental natures receive fresh nourishment from the energy of meditation and thrive.
An intelligent person will be very careful in his practice of meditation and take caution to release only as much energy as can be controlled and rightly used.