One of the purposes why the Qur'an was revealed is to summon people to think about creation and its works. When a person examines his own body or any other living thing in nature, the world or the whole universe, in it he sees a great design, art, plan and intelligence. All this is evidence proving God's being, unit, and eternal power. For Men of Understanding was written to make the reader see and realize some of the evidence of creation in nature. Many living miracles are revealed in the book with hundreds of pictures and brief explanations.