Write in a book.
God told Jeremiah to write all these prophecies down in a book. You don’t usually think of people back then having books, but sure enough they did. For some reason, many people think that books weren’t around until after the printing press made by Gutenburg. Alas, they were around, just not widely distributed to the general public. So, Jeremiah writes these words and records them in a book, as an act of obedience. And behold, here we are centuries, even millenia later, reading the prophecies God gave Jeremiah. What a powerful idea–to record words in a book!
Some words even change history. These words from Jeremiah/God are those types of words.