In order to fully appreciate the marvels in any construction or invention, one first needs to assemble detailed information about it and how it must have come to be.
For example, someone who lacks full, detailed knowledge concerning the pyramids of Egypt at Giza may dismiss them as simply so many piles of stone in the middle of the desert, and be quite unable to understand why they were widely considered to be one of the Seven Wonders of the World. Yet when one discovers that each one of these pyramids consists of some 2.3 million stone blocks weighing an average of 2.5 tons (2.75 short tons) each, that gives him pause. And when he learns about the geometrical knowledge used in the pyramids' location, the accuracy in the cutting of their blocks, the enormous sizes of the structures and the prevailing technology that was applied during the times in question, it is clear that one is dealing with a great miracle. Further, when one also learns about the pyramids' internal design, the secret chambers in them and many other hidden features, then one's amazement increases exponentially.
An even greater complexity is also displayed in the human body, which possesses many marvelous features in addition to the perfection of its external appearance. Without learning and reflecting on these details, you cannot come to a full realization of the miracles occurring within you. The fact is, however, extraordinary, near-instantaneous events take place inside your body whenever you fear that a car is about to run into you, when you catch the flu, suffer a rise in blood pressure, or even greet a friend. Molecules invisible to the naked eye work like honeybees inside your cells, performing in a matter of seconds or even microseconds actions that are so complex and require such sophisticated expertise that even cellular biologists have some difficulty in comprehending them—much less explaining them.
Almighty God, Creator of the entire universe and all living things and human beings without doubt created these molecules, with their flawless systems and breathtaking abilities, for a particular purpose. For that reason, it behooves anyone possessed of reason and good conscience to learn and reflect on the miracles in God's creation. Learning about them will be help you better understand the infinite might, knowledge, intelligence, greatness and glory of our Lord, the Creator of all these marvels.
As God has revealed in one verse:
... Only those of His servants with knowledge have fear of God. God is Almighty, Ever-Forgiving. (Surah Fatir, 28)
This book has been written to set forth certain proofs of the existence of our Lord, the Compassionate and Merciful, and the perfection of His creation, in a manner that every reader can easily comprehend. Man is an entity created by God. As you shall be discovering throughout this book, humans—right down to their tiniest atoms and molecules—behave with God's permission and knowledge and, like all entities in the universe, are totally submitted to Him. As God reveals in verses:
Everyone in the heavens and earth belongs to Him. All are submissive to Him. It is He Who originated creation and then regenerates it. That is very easy for Him. His is the most exalted designation in the heavens and the earth. He is the Almighty, the All-Wise. (Surat ar-Rum, 26-27)
In the creation of the heavens and the earth, and the alternation of night and day, there are signs for people with intelligence: those who remember God, standing, sitting and lying on their sides, and reflect on the creation of the heavens and the earth: "Our Lord, You have not created this for nothing. Glory be to You! So safeguard us from the punishment of the Fire." (Surah Al'Imran, 190-191)