Each person has dire need to worship God alone without associating anything to Him. That dire need has nothing equivalent to it and if it is not fulfilled will leave a void in one’s heart. This is similar to the body’s need for food, drink, and air. However, there is a big difference between the two, because the reality of a human is not his body, but his heart and soul. One cannot fill the void in the heart except by connecting with the true God who has no partner. No one will not find tranquility except by remembering Him.
The heart only finds solace in knowing and loving Him. Even if one experiences abundant pleasure or happiness through materialism or anything other than God it will not last. Rather the person will wander from one type of pleasure to another, from seeking the pleasure of one person to another. In actuality, those things that give people temporary pleasure are the greatest reason for their pain and emptiness. It is only in the remembrance of God that the heart finds comfort and tranquility.