This is an intriguing example of the lack of understanding human wisdom has about the nature of their inner body of Spirit. In many native tribes that cultivate spiritual perception, the ones who are being trained spend long, long amounts of time in darkness. This trains them to see and use their inner light. In his book, Living In The Heart, published in 2003, Drunvalo Melchizedek describes several examples from South America of this tradition. Spiritual blessings of Light to you, Explorer21.