Moses encourages the Jewish people to uphold their covenant with G-d that was forged at the Giving of the Torah on Mount Sinai.
In return for keeping the covenant, G-d would hold them especially dear, above His love for all other people.
What it means to be “set apart”
Therefore, when we do something that distances us from G-d, we can always return to Him. When we are motivated to return to G-d out of passionate love for Him, not only can we forsake negative behavior and habits at any instant (thereby defying the natural forces of inertia and habituation); we can even convert past deliberate wrongdoings into motivations for positive behavior.