23 Preface فَوَرَبِّ السَّماءِ وَالأَرضِ إِنَّهُ لَحَقٌّ مِثلَ ما أَنَّكُم تَنطِقونَYusuf AliThen, by the Lord1 of heaven and earth, this is the very Truth, as much as the fact that ye can speak intelligently to each other.Attention having been called to the Signs or Evidences of God’s working on the earth, within ourselves, and in the heavens, in verses 20-22, an appeal is made to our own inner conscience, in the name of the Lord of heaven and earth, to acknowledge and act up to the truth of Revelation, and turn to the spiritual Realities. For they are as real as our own conscious and self-intelligent existence, on which is based all our knowledge. As a philosopher (Descartes) has said: “I think; therefore I am.”