That is to say, the beginning of one’s life is pure and innocent. Everything is new and fresh in his eyes, and he takes whatever he sees. He gets to know the mountain when he is told so and he knows the river as is told by others.

With his growth and the increase of experiences, he gradually finds out the problems of the world. The world has more and more problems and the problems are more and more complex. The right and the wrong are often confused; the justifiable claims get no justice, whereas the unjustifiable can go everywhere; the kind are never rewarded but the wicked can last forever. When entering this stage, men are indignant, resentful, anxious, doubtful, cautious and sophisticated.