Jeremiah 31:31-34 provides an encouraging conclusion to the saga of Israel and Judah once they have repented and returned to the land. These verses, quoted in Hebrews 8:8-12 and 10:16-17, show that this is the same covenant that the church has already made with God. Rather than doing away with the law of God, the New Covenant gives the people the means, not merely to obey it, but to accept it and make it a part of their lives. God will give the people of Israel and Judah new hearts, and they will finally be able to follow God consistently and have real relationships with Him. God will forgive their sins, and Israel will finally begin to be the witness to the rest of the world that God intended her to be (see Deuteronomy 4:5-8; Isaiah 62:1-2).
Even though God makes this covenant primarily with Israel and Judah (Jeremiah 31:31), it is not exclusive. Through Isaiah, God shows that Gentiles who submit themselves to Him can and will also make this covenant. Of particular interest is the requirement that the Sabbath be kept by those wishing to do this (Isaiah 56:1-2, 6-8).
Ezekiel 11:17, 19-21 foretells of Israel and Judah receiving from God a new heart—a spiritual heart that will enable them to keep His commandments and statutes.
Throughout its history, the essential difficulty in Israel's relationship with God has been one of the heart. God exclaims, "Oh, that they [Israel] had such a heart in them that they would fear Me and always keep all My commandments, that it might be well with them and with their children forever!" (Deuteronomy 5:29). In Hebrews 3:10, God again identifies this problem: "Therefore I was angry with that generation, and said, 'They always go astray in their heart, and they have not known My ways'" (emphasis ours throughout).
The heart or spirit of a man is the center of his thought, reason, and motivation. Because of human nature, the natural—unconverted—heart is "deceitful above all things, and desperately wicked" (Jeremiah 17:9). It has an innate, powerful pull toward the self, always making evaluations based on what it perceives as good for the individual regardless of the effect on others. Humanity has had approximately 6,000 years of such self-centered and destructive living, proving that man is simply unable to govern himself for very long. He needs direction and leadership from another—divine—source.
The Old Covenant that God made with Israel was a good agreement as far as it went, because all of God's works are good. The problem was not with its terms, but with the people who made it (Hebrews 8:7-8, 10). They lacked the right heart that would have allowed them to follow God truly and obey His laws. God, though, will give a new heart—a new spirit—to repentant Israelites, along with any others who desire to covenant with Him.
This "new spirit" is the Spirit of God—the Holy Spirit (see also Jeremiah 32:37-42; Ezekiel 36:26-27; 37:14; 39:29; Joel 2:28-29). It is the same Spirit that Jesus told His disciples they would receive, the power that would allow them—through their words and especially through the conduct of their lives—to be witnesses of God (Acts 1:8; see Luke 24:49). It is a Spirit "of power and of love and of a sound mind" (II Timothy 1:7)—a mind that is balanced because God's concerns reside at its core. It is a mind inclined to obey God and to seek Him as the only Source of true solutions in a world that does not have the means or inclination to live in a way that is good for everybody and good eternally.
As Israel becomes God's model nation, due to her new heart and Spirit, the rest of the world will see that God's way—including His commandments, statutes, and judgments—produce peace and abundance. It is the nature of God's laws that, because of their Source, they bring good, prosperity, health, abundance, peace, and contentment (Deuteronomy 4:5-8). Yet, it takes the same spirit—heart—as the Lawgiver for one to understand and keep the laws in their true spiritual intent.