He is Allah—there is no deity but Him. He is the King, the Most Pure, the Perfect Peace, the Trustworthy, the Safeguarder, the Almighty, the Compeller, the Supremely Great . Glory be to Allah above all they associate with Him. (Surat al-Hashr, 59:23)
Allah describes His greatness through the examples He gives in the Qur'an. For example, when Prophet Musa (as) requested “My Lord, show me Yourself so that I may look at You!” Allah replied: "You will not see Me, but look at the mountain. If it remains firm in its place, then you will see Me.” The rest of the account is related, as follows:
... But when His Lord manifested Himself to the mountain, He crushed it flat and Musa fell unconscious to the ground. When he regained consciousness, he said: “Glory be to You!...” (Surat al-A‘raf, 7:143)
When Prophet Ibrahim (as) said: “My Lord, show me how You bring the dead to life,” Allah replied: “Take four birds and train them to yourself. Then put a part of them on each mountain and call to them; they will come rushing to you. Know that Allah is Almighty, All-Wise.” (Surat al-Baqara, 2:260) This way, Allah showed him a sign of His greatness.
Allah told Prophet Lut (as) to leave his city early in the morning with the believers and not to look back. That morning, He destroyed the unbelieving nation and rescued Prophet Lut (as). Allah made the fire coolness and peace for Prophet Ibrahim (as). By the hands of Prophet ‘Isa (as), He healed the blind and brought the dead to life. In the time of Prophet Musa (as), He parted the sea and drowned Pharaoh's army. This is how Allah manifests His greatness and part of His infinite power.
Allah openly reveals His greatness and power at every moment and in every incident. At dawn, He sends a hurricane toward those who greedily feel attached to this life of the world, or turns their cities upside down and makes them uninhabitable. This way, He strips them of their possessions and goods.
He submerges an entire city by pouring a heavy rain upon it, or ruins it by sending a great earthquake. The skies and the ground, the wind and the rain, all of which act under His surveillance, bring an unseen destruction to that city, and its people witness Allah's overwhelming power. No doubt, Allah is al-Mutakabbir . In the face of His power and strength, no one can become arrogant. He is the sole authority before Whom all will prostrate.