Sforno on Deuteronomy 4:40/ספורנו על דברים ד׳:מ׳

1ושמרת את חקיו, Once you have understood all this you will naturally observe all of G’d’s statutes. Jeremiah 10,7 already expressed this as a given when he asked (rhetorically) מי לא ייראך מלך הגוים, “who would not be in awe of You, King of the nations?”

2ואת מצותיו אשר אנכי מצוך היום, כל הימים, the reason you will be observing these laws for all time is that the religion will not be renewed or altered, ever.