Like most of the prophets, Jeremiah’s warning concerns God’s dealing with the affairs of man once and for all. Jeremiah is one of those who are concerned with the “Day of the Lord.” It’s coming and there is nothing we do about it. Jeremiah 
4:14-16 is clear warning to Israel: “For a voice declares from Dan and proclaims trouble from Mount Ephraim. Warn the nations that he is coming; announce to Jerusalem, Besiegers come from a distant land; they shout against the cities of Judah.”
Feinberg writes, “The need for repentance is urgent. The foe is near; there is little time left to return to God. Dan was the northern boundary of the land; Mount Ephraim was the northern border of Judah, not far from Jerusalem. The invaders are making rapid progress. So unprecedented is the fate that will now overtake God’s people that the nations are called on to witness the judgment soon to fall on Judah. Resistance has not availed against the invaders; so they are finally seen besieging the capital, Jerusalem.”[1]
All the prophets make it clear that God is in charge of it all and will bring complete resolution in the end. We don’t know when that will happen or exactly how that will happen although there are many modern prophets claiming to know the when and the how. The more I study prophecy and especially the book of Revelation the less confidence I have in my own understandings and the more confidence I have in God. He’s going to take care of it. I believe the most important thing in life is learning to trust God. Just trust Him! MacArthur writes, “People who can ride through the toughest issues of life and remain calm are not indifferent; they’re just trusting God. What if our ride is a little bumpy? What if we’re feeling troubled, anxious, and fearful? How can we restore the peace? How can it remain uninterrupted? The psalmist said to himself, ‘Why are you in despair, O my soul? And why have you become disturbed within me? Hope in God, for I shall yet praise Him, the help of my countenance, and my God” (Ps. 42:11). He reminded himself that God was there to help him. We can trust Him because He is trustworthy. He genuinely cares for us.” [2]
[1] Charles L. Feinberg, “Jeremiah,” in The Expositor’s Bible Commentary: Isaiah, Jeremiah, Lamentations, Ezekiel, ed. Frank E. Gaebelein, vol. 6 (Grand Rapids, MI: Zondervan Publishing House, 1986), 408.
[2] John MacArthur, Anxiety Attacked, MacArthur Study Series (Wheaton, IL: Victor Books, 1993), 89.