The brain contains a pea-sized organ that weighs around 0.5 grams (0.017 ounce) and, amazingly enough, supervises and regulates the entire body. Known as the pituitary gland, this most complex, flawless, and vital administrator distributes jobs to countless hormones and monitors each one, all of which have their own appointed tasks, without interruption.
We move our heads and arms, see, hear, smile, speak, and touch all at the same time. We remember what people have said to us and analyze things. All of the sensations that reach us and our movements take place by means of hormones. The pituitary gland enables hundreds of processes to take place simultaneously, flawlessly, and without delay. There is no question of any hormone running late; being unable to transmit the messages that reach them; or, apart from exceptional cases of sickness, of hearing what a person who is talking to us only after several minutes have passed; or of not feeling the sensation of being burned before the burn appears on our hands. This is because the tiny pituitary gland, which consists of protein, water, and fat, flawlessly carries out all of its tasks because Allah, the Lord of the worlds, wills it to do so.
Anything that any entity does occur only because of His will, for nothing is independent of His power and control. When Allah so wills, He manifests His Own might and greatness as He wills through a particular entity that He has created. Everything we see or do not see, but that we know about, is a separate manifestation of His infinite Greatness:
That is Allah, your Lord. There is no deity but Him, the Creator of everything. So worship Him. He is responsible for everything. Eyesight cannot perceive Him, but He perceives eyesight. He is the All-Penetrating, the All-Aware. “Clear insights have come to you from your Lord. Whoever sees clearly does so to his own benefit. Whoever is blind, it is to his own detriment. I am not here as your keeper.” (Surat al-An‘am, 102-04)