In the course of our prayers, Shema is a little unusual. During the Pesukei D’Zimrah, we praise G-d, as the section’s name indicates; during the Amidah and Tachanun (“Supplication”), we ask for things; but during Shema, we address ourselves and make something quite like a declaration of faith.
A declaration of faith would be something like the Ani Ma’amins, the “I believe” statements, that appear in siddurim following Shacharit. “I accept G-d as my King” would perhaps be a declaration of faith. But when we say Shema we do not declare our faith as much as instruct our faith. Listen, Israel, Hashem is our G-d, Hashem is One! We simultaneously declare it aloud and actively listen, accepting this as true in our hearts.
Seen in this manner, we understand that Shema is more of an inner dialogue than an outward monologue or declaration. We recognize that we must urge ourselves forward, push ourselves onward in our relationship with G-d. We take the responsibility of representing G-d in this world, of abiding by His covenant with us, and of being our own coach and guide in this process. We accept responsibility for ourselves and our choices when we declare and listen to the Shema.
Shema, then, is an exhortation towards faithfulness. When we listen to its words, we not only accept G-d’s sovereignty but also our responsibility to actualize His reign as a motivating idea and ideal.