Your Saying "God is Most Great" does not mean that He is greater than something else, since there is nothing else alongside of Him, so that it could be said that He is greater than it. Rather, the meaning of Allahu Akbar is that He is much too great to be perceived by the senses or for the depths of His Majesty to be reached by reason and logic, and indeed, that He is much too great to be known by an other-than-Him for truly, no one knows God but God.
Ibn Ata AllahKnow that the science of unveiling has no end to it, for it consists in the journey of the intellect in the stations of Majesty, Beauty, Sublimeness, Grandeur, and Holiness. . . . He to whom the mysteries of La ilaha illa'llah are revealed draws near to God, and his worship of God becomes sincere. He does not turn to anyone but to Him, nor does he have hope in or fear other than Him, nor does he see harm or benefit except as coming from Him. He abandons whosoever is not He and rids himself of inward and outward associationism (shirk).
Ibn Ata AllahIf He opens a door for you, thereby making Himself known, pay no heed if your do not measure up to this. For, in truth, He has not opened if for you but out of a desire to make Himself known to you. Do you not know that He is the one who presented the knowledge of Himself to you, whereas you are the one who presented Him with deeds? What a difference between what He brings to you and what you present to Him!
Ibn Ata Allah