What is great or the sign of someone being great? What action do you have or show that God is Great? God has revealed His greatness to us mostly through His Son, Jesus the Christ. God revealed His omniscience as Jesus taught and amazed the crowds with His knowledge. God revealed His omnipotence as Jesus performed miracles and mighty works. God revealed His omnipresence as Jesus walked the earth and ascended to heaven, but also promised that He would be with us till the end of the age (Matt 28:20). We see the greatest of the greatness of God in the gospel of Jesus as He wisely and powerfully conquered Satan, sin, and death with His bodily presence.