Charles Spurgeon Commentary Jeremiah 9:14-15

"but have walked after the stubbornness of their own heart, and after the Baalim, which their fathers taught them; therefore thus saith Jehovah of hosts, the God of Israel, Behold, I will feed them, even this people, with wormwood, and give them water of gall to drink." — Jeremiah 9:14-15 (ASV)

Which their fathers taught them: therefore thus saith the LORD of hosts, the God of Israel; Behold, I will feed them, even this people, with wormwood, and give them water of gall to drink.

You cannot sin without suffering. If you will not drink of the waters of obedience, but will drink of the waters of rebellion, they shall be bitter.