A childlike spirit is the litmus test for spiritual maturity and against spiritual disorder. Not all spiritual growth is healthy. The Chinese has a term “Zouhuo Rumo 走火入魔,” which is equivalent to Kundalini Syndrome, a condition when a spiritual pactice gets derailed or melfunctioned that leads to mental and emotional disorders. In Christianity, I would call it Pharisee Syndrome. Pharisees are very spiritual people. They are very "faithful" to the scriptures, but according to Jesus, they are not "fruitful" because they got stuck in their egos and arrogance that caused the spiritual disorder.