In the Qur'an it is said that God has taught man by the skill of His pen. And what does that mean? It means that to the man who lives the inner life, everything that he sees becomes a written character and this whole visible world a book. He reads it as plainly as a letter written by his friend. And besides this he hears a voice within — which becomes to him a language. It is an inner language; its words are not the same as the words of the external language. It is a divine language.
— Hazrat Inayat Khan, The Inner Life