The lonely and great philosopher Schopenhauer not only studied his own philosophy, but also studied medicine, physics, botany, astronomy, meteorology, physiology, bones, law, mathematics, history, music- this is what he can discuss everything with authority and honor. He puts the things discussed in a deep and broad perspective. Through the examination of phenomena, the nature of things and the relationship with other things can be clear at a glance. Therefore, he proudly said- and the world's evaluation of him: My philosophy is undoubtedly the true answer to the mystery of life.