—Deuteronomy 26:17-19 (NASB)
The evidence of our faith and belief in God is in the degree to which we change our behavior to "walk in His ways and keep His statutes, His commandments and His ordinances, and listen to His voice". According to His Word and His Word alone we walk, keep, and listen. And what does He confirm from His end? That we "should keep all His commandments". It's not just something we voluntarily undertake as a new creation in Christ, it's a continuing requirement to which He requires our vigilant adherence. It's not just something we offer, it's required. "His ways", "His statutes", "His commandments", "His ordinances", and "His voice". How is it that we come to tolerate OTHER ways, rules, and guidance?
The end result of following through in these things is that we "shall be a consecrated people to the Lord your God". We will be "the salt of the earth" (Matthew 5:13), "the light of the world" (Matthew 5:14), "a city on a hill" (Matthew 5:14), the "light to all" (Matthew 5:15). If we don't seem to be the people of God that we know we should be, the odds are that to the degree that our obedience falls short, we fail to "be a consecrated people".
We have to follow through what He said with what WE said, so that our obedience would indeed result for us to "be His people, a treasured possession".†††