Allah invites man to study the wisdom that underlies variety in the world. In fact, the whole system is based on a variety, and a range of things. For example take the case of the signs of day and night: "You see these opposite things daily in your life. If you consider the underlying wisdom, you find that without this variety there would hardly be any activity in the world. Likewise, great wisdom lies in the creation of people with different temperaments, thoughts and inclinations. If Allah had made all men righteous by birth or did not create disbelievers and wicked people and left only believers and peaceful people in the world, the purpose of man''s creation could not have been realized. Therefore, it is wrong to desire that there should only be day and no night.
