The very first verse tells you what the entire book of Deuteronomy is about: the statues and judgments of the Lord. A statute is a pre-described task, something that God has explained and given as a task. A judgement tells us how to carry out the decision of a judge. A judgement elaborates how to to perform a particular statute. Judgements are not always negative, sometimes judgements are favorable.
There’s a direct correlation between the increase in knowledge and a decrease in our love and fear of God. Proverbs says that the knowledge and fear of God is the beginning of wisdom. The more God blessed the children of Israel while they were in the land, the more they desired to go after idols and false gods.
They served gods who didn’t love them, or even appreciate them. The “principalities of the air” aren’t trying to draw men and women to worship them because they love them. They want power, submission and control over people, they have no interest in mankind’s well being at all.
The “principalities of the air” won’t give their only begotten son to die for us and to give us eternal life. There is only one God who has that kind of love.
Moses reminds the children of Israel in Deu. 4:15 that they are to “…Watch yourselves carefully, since you did not see any form on the day the LORD spoke to you at Horeb from the midst of the fire.” This is repeated several times to emphasize God’s admonition against idolatry but Moses also prophesies they will ignore this warning and God will have to rebuke them harshly for their idolatry.
Scripture tells us that man’s heart is “deceitful above all things.” This chapter gives us some guidelines on how a believer is to train his/her heart so it is inclined towards God rather than towards the cares of this world. Deut. 4 teaches us to follow God’s statutes, judgements and commands. We are also called to understand that giving our heart to God is not a one time decision but as it says in Deut. 4:9, “Only give heed to yourself and keep your soul diligently, so that you do not forget the things which your eyes have seen and they do not depart from your heart all the days of your life…”