Compare Wycliffe Bible (1395) with King James Version side-by-side to understand the meaning.
Jeremiah 9 is the quintessential "Lament" of the weeping prophet, who wishes his head were a "fountain of water" so he could weep day and night for the slain of his people. The setting is a society of "deceit" where "every brother is a supplanter" and where men "teach their tongue to speak lies." This starts with the prophet’s desire to "leave my people and go away," seeking a "lodging place for travelers" in the desert to escape the "adulterous" and "treacherous" atmosphere of the city. It establishes that the breakdown of the "covenant with God" is inextricably linked to the breakdown of "truth between neighbors."
The story follows the Lord’s decision to "refine them and test them," for "what else can I do with my people?" Jeremiah portrays the coming of the "wailing women" to lead the dirge, as "death has come up into our windows" and entered our palaces. This portrayal of a "Harvest of Death" shows that the "glory" of man—whether in wisdom, might, or riches—is a vapor that vanishes in the face of judgment. It highlights the only legitimate boast: "that he understands and knows me, that I am the Lord who practices steadfast love, justice, and righteousness in the earth."
Theological depth is found in the "Knowledge of God" as the only true human glory. It reveals that a society built on "deceit" and "knowledge of idols" is structurally unsound and must be "refined" through the fire of affliction. This chapter is fundamental for understanding that the "Circumcision" that matters is that of the "heart," for even those who are "circumcised in the flesh" will be punished if they remain uncircumcised in their inner being. It highlights that the "tears" of the prophet are the only appropriate response to a world that has lost its "boast" in the Lord. the lamentation for the city now turns to the comparison of the Creator and the wood.
Jesus Christ is the one who "wept over Jerusalem," becoming the ultimate "Fountain of Tears" because His people did not know the "things that make for peace." He is the one who "practices steadfast love, justice, and righteousness" and who is the only legitimate "Boast" of the redeemed. While the world's wisdom and might failed, Christ’s "weakness" on the cross was the power that saved us. The crying of the wailing women now gives way to the satire of the craftsman.