Jeremiah knows that the people know Yahweh. The people know all the stories--how Yahweh rescued them from slavery in Egypt and made a covenant with them that they would always be Yahweh's chosen people. But they have made "as many gods...as [they] have towns." (Jer. 2:28). Despite Yahweh's faithfulness to them, they are running every which way, making gods of everything they can find, worshiping whatever makes them happy for the moment. They don't even bother trying to hide their rejection of Yahweh. They simply tell Yahweh that they just can't worship him anymore.
There are days when I feel like I could be a wild donkey in the wilderness, and days when I'm pretty sure I am. I'm easily distracted from the one who loves me unconditionally, seeking love and acceptance elsewhere; distracted from the one who offers salvation and reconciliation and instead expecting salvation and reconciliation from people, and even institutions.
I am grateful this Lent for the chance to focus, to notice my "wild donkey in the wilderness" tendencies, and to invite God to help me focus on the one who freed me from slavery to sin and death and made with me (us) a new covenant by the waters of baptism and the gift of the Holy Spirit.