As there is a gradual process from the mineral to the human kingdom, so is there also a gradual process from a certain state of human evolution to a state of human perfection. What is it that gives man the inclination to hear a word of admiration, a word of praise that satisfies him? What is it that pleases him in hearing the voice, the word of his friend? What is it that charms him in music, in poetry, and gives him joy? It is the same word that was lost appearing in different forms.