Quote from : The Alchemist Book

With every day that passed, the boy's heart became more and more silent. It no longer wanted to know about things of the past or future; it was content simply to contemplate the desert, and to drink with the boy from the Soul of the World. The boy and his heart had become friends, and neither was capable now of betraying the other. When his heart spoke to him, it was to provide a stimulus to the boy, and to give him strength, because the days of silence there in the desert were wearisome. His heart told the boy what his strongest qualities were: his courage in having given up his sheep and in trying to live out his destiny, and his enthusiasm during the time he had worked at the crystal shop.