Because when a person looks down he sees mud, but when he looks up there are beautiful stars and planets. It only depends which way one looks, upwards or downwards. What is this mortal world? What is this physical existence? What is this life of changes? If it were not for belief, what use is it all? Something which is changing, something which is not reliable, something which is liable to destruction. Therefore it is not only for the sake of truth, but for life itself that one must find belief in oneself, develop it, nurture it, allow it to grow every moment of one's life, that it may culminate in faith. It is that faith which is the mystery of life, the secret of salvation.