Deuteronomy 10

12 Moses outlined many detailed laws for the Israelites, but their essence can be distilled down to this: We are to reverently love, serve, and obey God wholeheartedly.
13 People often see God's commands as burdensome and restrictive, but we should remember that His commands are for our good. Many of the commands dealt with health and social issues. Obedience to them helped one live long and at peace with one another. Other commands dealt with spiritual issues. Obedience to them demonstrates one's love for God. Those who please God will enjoy the benefits of His love both in this lifetime and in the next.
14 God created all things, and He knows how they should all work together. His commands describe how He wants us to live and behave. Before the fall of Adam and Eve, only a few commands were needed because everything was good. After the fall, many commands were needed since sin entices us to do many things that offend and separate us from God.
15 God loved Israel's forefathers, and the descendants enjoyed the benefits of God's promises to them. No one could successfully oppose Israel since God was on their side. If the Israelites continued to please God, they would continue to enjoy God's favor.
16 Moses attaches this meaning to the ordinance that God gave Abraham that all his male descendants should be circumcised. Sin is like a covering that shields our hearts from God. It makes us stubborn and disobedient to Him. Therefore, we should desire to get rid of this barrier. Circumcision of the foreskin reveals what is normally hidden. In a similar way, removing sin from our hearts reveals who God intends us to be. The removal of sin also allows us to have an intimate and pleasing relationship with God.
17 This does not mean that God is one among many. God alone has diving authority. People tend to attach divinity to created things like wood, metal, stone, plants, animals, and people; but since God created them, they are ultimately subject to His authority. In other places, it is clear that we are to worship no thing or person besides God (Exo 20:3-7).

God's commands are not based on whims, but are given with the foreknowledge of eternity in mind. God knows what is best for all people for all times, and so He reveals these things to us. Other "gods" and lords (rulers of people) can be influenced by money and sacrifices. God is not influenced by these things because He made them all, and they all belong to Him.

18 God even cares for those who people normally ignore. Though His hand may be unseen, He provides for all people though circumstances or the generosity of people.
19 The Israelites were to learn a lesson from their past. These people had been slaves as children, so they knew what it was like to be used and abused because they were "foreigners" to the Egyptians. God does not want us to be abusive to one another. Therefore, we are to treat people we do not know with love and compassion, just as God does.
20 Oaths are appropriate when we want to remind ourselves that we are accountable. Oaths, therefore, should not be made invoking things that have little accountability worth, like ourselves, people, or other created things. Ultimately, all things are accountable to God, so if we want to remind ourselves of this accountability, we can confirm a promise with an oath to God. In light of this, we should also recognize that we should not "waste" such significant oaths on petty promises or actions that contradict God's commands.

Jesus later clarifies that we should not need to swear oaths at all (Mat 5:34-37). Our integrity is founded on our relationship with God. If we have a good relationship with God, we can be taken at our word and there is no need to try to prop up a promise with an oath. To "have" to add an oath indicates that there is a lack of trust between people, which means that there is sin somewhere in that relationship.

22 The increase of Israel is directly attributed to God. Seventy people became a nation of slaves. God freed this nation of slaves and led them through the wilderness. Now God has promised to go before them and conquer the nations in the Promised Land. A nation of slaves was now the most important nation on earth. The weakest among people was now undefeatable because God was with them. What great rewards people attain from obedience to God. He is worthy of our love, devotion, and praise.