שמע ישראל, האדון הוא אלוהינו, האדון הוא אחד, האדון הוא אנחנו, האדון הוא הכל..
Hear O Israel, the Lord your G-d, the Lord is ONE, the Lord is US, the Lord is ALL.
So, what does this mean? It is a declaration. It states that G-d exists, that there is only one G-d, that we are G-d (Thou art G-d), that G-d is everything, that G-d is all that exists.