The Talmud in tractate Brachos (33b) tells us of a person who ad-libbed in Shemoneh Esrei, calling G-d great, mighty, awe-inspiring, majestic, powerful, and a string of other praises. Rabbi Chaninah criticized him, saying that G-d’s praises are infinite; once one starts saying them, how can he ever stop? Rather, we just say that He is great, mighty and awe-inspiring, which is derived from Moshe’s use of those terms in this verse.