28 “And if they refuse to accept the cup from your hand to drink, then you shall say to them, ‘Thus says the Lord of hosts: You must drink! 29 For behold, I begin to work disaster at the city that is called by my name, and shall you go unpunished? You shall not go unpunished, for I am summoning a sword against all the inhabitants of the earth, declares the Lord of hosts.’ – Jeremiah 25:28-29
I imagine that it is passages like this one that caused Paul to write with such a dire tone in Romans 11; warning us about the consequences of turning away from God. When Israel and Judah refused to listen to God’s prophets, and when they turned away from God commands; they were not spared from judgment. If God was willing to punish His chosen people, the ones who had been spared from so many calamities earlier in their history (see Exodus for instance); He will do the same for anyone. God is a God of mercy, but He will only be pushed so far. We can take heart from this however, by realizing that God will do all that He has promised. If God is willing to do the unpleasant, how much more does His heart long to deliver the good He has promised to you.