Here ‘six Days’ means six Days of God. In the language of human beings, it may be called six stages or six periods. The Creation of the Universe in six stages indicates that it was done in a well planned manner. Whatever is brought into existence on the basis of a plan and a specific arrangement cannot be futile. In the question the stress is on the subject matter and not on the person to whom the question is put. The idea is that if a man is acquainted with God’s wonderful marvels, he will be able to tell you how High and Mighty is the Merciful God. The research undertaken by scientists in modern times partially fits the meaning of this verse. If a man learns the secrets of the universe which have come to light as a result of scientific research, he will become extremely excited, his hair will stand on end and his heart will spontaneously bow down before the Might of the Creator.