Chapter 13:

God tells Jeremiah to buy a linen loincloth and wear it, but tells him not to wash it.  Then he tells Jeremiah to take the loincloth and hide it in a cleft in some rocks by the Euphrates. After a while, God sends Jeremiah to get the loincloth, which is totally filthy and disgusting. God says that this is what's happened to Judah and Jerusalem. They were originally supposed to be like God's own loincloth, clinging to him in righteousness. But their disobedience has rendered them useless and ruined.

Again, Jeremiah begs the people to change their ways before it's too late.  He says that he'll secretly weep for them if they don't repent.

He sees all of Judah taken into exile, and sees the crown of the king and the queen mother knocked off their heads.  If the people ask why all these bad things are happening, they should know that it's punishment for their sins. Jeremiah compares what's happening to Judah to a rape.

God says he'll scatter his people and publicly expose Judah to the world, lifting up its skirts for everyone to see.

The chapter concludes with God saying that he's seen Jerusalem's adulteries and lust and wondering if it will ever make itself clean.

Chapter 14:

God sends a message through Jeremiah: Judah's under siege totally demoralized. When nobles send their servants to get water from the cistern, they find it dry.  A drought is just making everything worse. Even the wild donkeys are hungry and exhausted.

God tells Jeremiah not to pray for his people. He won't accept their fasts and their offerings. Instead, he's going to slaughter them with war, famine, and pestilence.

Jeremiah asks God why the other prophets are all telling the people that there will be peace.  God says that he didn't send these prophets; they're a pack of misguided liars, spreading false info, all that "don't worry, be happy" stuff.

Those prophets will all die by the sword, and their relatives and followers will be consumed by war and famine, with no one to bury their corpses.

But Jeremiah's supposed to tell the people that he weeps for them, seeing their dead bodies scattered everywhere he looks.

The people (or Jeremiah speaking in their voice) end the chapter by begging for mercy.

They admit they've been pretty impossible to deal with, and ask God to keep up his side of the covenant.