But the adult is not the highest stage of development. The end of the cycle is that of the independent, clear-minded, all-seeing Child. That is the level known as wisdom. When the Tao te Ching and other wise books say things like, "Return to the beginning; become a child again" that's what they are referring to. Why do the enlightened seem filled with light and happiness like children? Why do they sometimes even look and talk like children? Because they are. The wise are Children Who Know. Their minds have been emptied of the countless minute somethings of small learning and filled with the great wisdom of the Great Nothing, the Way of the Universe.