What is realization of God? The realization of God is the realization of that Being who has created man, who has granted man with a personality which is unique throughout the vast universe, Who has created the planet earth for man and who has established a unique arrangement for man’s survival which is called the life support system.
A person’s quest does not stop here but rather becomes a part of his life in the form of a process of discovery. Now, he discovers his relationship with God. He grasps the reality that he is not free but is under the command of God. In the process, he realizes that he is not free but has to act at God’s behest and be accountable to Him. Death is not the end of his life, for another life begins after death, where he will stand before God, so that God may declare His final decision about his eternal future.
This process of discovery continues until he realizes that the end of his life is going to culminate in the form of either eternal Paradise or eternal Hell. This quest makes him extremely serious about the course his life should take. Now he plans his life anew. Now he redefines everything. If at first all his activities were self-oriented, now they are God-oriented. It is this very lifestyle which is called Islam.
Source: Discovering God