The prophets were preaching lies and the priests were ruling over the people by their own power and influence. Priests were to be servants of God, representatives of the people to go before God on their behalf. They were to carefully and humbly maintain the temple and lead the people in worship and repentance. Though the priests claimed to be serving God, God was no longer in the picture. They were exercising their influence and enjoying their power over the people. "Prophets" were speaking their own words, not God's.
And the people loved it! They didn't have to think about their sin! They answered to man, not God. As long as they could keep each other happy, life could move on, and they could enjoy their sin.
There is an end to that kind of living. It's the judgment of God.
Though they had strayed so far, God was urging them, through the words of Jeremiah, to return to Himself. You may have strayed far from God. Your sin may have taken you to a strange land where you are serving strange people (Jeremiah 5:19). Quit listening to the lying voices that want to keep you happy in your sin. Is there a Jeremiah in your life, tearfully pleading you to turn back to God? Listen to that voice.