Surah 51. Az-Zariyat, Ayah 23

Lit., "even as you speak" or "are able to speak": an allusion to man's ability to think conceptually and to express himself - that is, to something of which man is absolutely, axiomatically conscious.

Attention having been called to the Signs or Evidences of Allah'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."