Know therefore this day, and consider it in thine heart, that the LORD he is God in heaven above, and upon the earth beneath: there is none else.
To say that God is sovereign is to say that He is supreme over all things, that there is no one above Him, that He is absolute Lord over creation. It is to say that His Lordship over creation means that there is nothing out of His control, nothing that God hasn’t foreseen and planned….
God’s sovereignty logically implies His absolute freedom to do all that He wills to do. God’s sovereignty does not mean that He can do anything, but it means He can do anything that He wills to do. The sovereignty of God and the will of God are bound up together. The sovereignty of God does not mean that God can lie, for God does not will to lie. God is truth and therefore God cannot lie, for He wills not to lie. God cannot break a promise, because to break a promise would be to violate His nature, and God does not will to violate His nature.
Therefore it is silly to say that God can do anything. But it is scriptural to say that God can do anything He wills to do. God is absolutely free—no one can compel Him, no one can hinder Him, no one can stop Him. God has freedom to do as He pleases—always, everywhere and forever. AOGII144-145
God in heaven above and on the earth beneath, I willingly give You my life; take it and sovereignly do whatever You will to do with it. Amen 
39–40 Based on all the marvelous things the Lord has done for them already, God’s children are exhorted to acknowledge his utter uniqueness and obey his commands with the result that this generation and all future generations will experience God’s abundant blessings. Moses challenges his fellow Israelites to “take to heart” or internalize the fact that Yahweh is the universal sovereign (“in heaven above and on the earth below”) and the only sovereign (“there is no other”). In the light of that theological reality, they should gladly obey his commands. Moses affirms that Israel’s genuine obedience to God’s commands will occasion long tenure in the land (and continued enjoyment of covenantal blessings).
As seen in 4:1 (see comments there), Moses is not simply holding before Israel the hope of long tenure in the Promised Land as a bribe or incentive. Granted, Israel’s obedience or disobedience to God’s covenantal expectations did affect whether they would remain in the Land of Promise. Nevertheless, Yahweh intended that Canaan would serve as a platform for his people to demonstrate his greatness to the surrounding world. God offered them the opportunity to live lives that exalt his greatness before the world around them for the undetermined future.
4:37–39 Juxtaposed with God’s universal sovereignty is his love of Abraham, Isaac, and Jacob (see notes on 1:8; 4:31). loved. A key, and unique, theme of Deuteronomy is the love of God for the patriarchs (here and 10:15), or for his people in general (5:10; 7:9, 12–13; 23:5), and Israel’s reciprocal love for God (6:5; 7:9; 10:12; 11:1, 13, 22; 13:3; 19:9; 30:6, 16, 20). as it is this day. See note on 2:30. know … and lay it to your heart. Deuteronomy is constantly concerned with the state of Israel’s heart (see 6:4–5; 7:17; 8:2, 17; 9:4; 10:16).
4:39–40. In light of such electing grace and such unique revelation the Israelites were to acknowledge that the Lord is God alone (cf. v. 35) and to keep His decrees and commands. Only in doing these two things would the Israelites find prosperity and long life in the land (cf. 5:33; 6:2). The words so that it may go well with you occur eight times in this book, undoubtedly to emphasize this motive for obedience (4:40; 5:16; 6:3, 18; 12:25, 28; 19:13; 22:7). The idea that righteousness lengthens life and sin shortens it is common in the Old Testament (Prov. 3:1–2, 16; 10:27).
4:39 God in heaven … there is no other: Since no other God was Creator, Lord of history, Teacher, and the Lover of His people, Israel had to respond to God alone. This is a major theme of Deuteronomy and of the prophets. The incomparability of Yahweh is also the heart of the basic creed of Israel, the “Shema” (6:4).
 Tozer, A. W., & Eggert, R. (2015). Tozer on the almighty god: a 365-day devotional. Chicago, IL: Moody Publishers.
 Grisanti, M. A. (2012). Deuteronomy. In T. Longman III & D. E. Garland (Eds.), The Expositor’s Bible Commentary: Numbers–Ruth (Revised Edition) (Vol. 2, p. 529). Grand Rapids, MI: Zondervan.
 Crossway Bibles. (2008). The ESV Study Bible (p. 339). Wheaton, IL: Crossway Bibles.
 Deere, J. S. (1985). Deuteronomy. In J. F. Walvoord & R. B. Zuck (Eds.), The Bible Knowledge Commentary: An Exposition of the Scriptures (Vol. 1, p. 271). Wheaton, IL: Victor Books.
 Radmacher, E. D., Allen, R. B., & House, H. W. (1999). Nelson’s new illustrated Bible commentary (p. 240). Nashville: T. Nelson Publishers.