Faith; Belief in G-d

“What have you been doing for the last year?” asked the incensed father-in-law. “What have you accomplished wasting your time by those wild men?” “I learned that G‑d creates the world,” answered the young man.

Twice Moses states in our Parshah that "there is none else"--that nothing exists aside from G-d. Are these just words, or do they mean something that we can understand?