'God is Great' in the Bible

"I tell you that among all that are born of women not one is greater than John; yet he that is little in the kingdom of God is greater than he."

and shall persuade our heart in his presence whenever our heart condemns us, because God is greater than our heart and knows all things.

If we accept men's testimony, the testimony of God is greater; for this is the testimony of God, that he has borne testimony concerning his Son.