The verse was spoken to exiles about a specific 70-year promise, so it isn't a personal guarantee of prosperity. But it reveals God's unchanging heart, and in Christ that good heart toward you is more certain than ever.
The Grace Answer
Jeremiah 29:11 shows up on coffee mugs and graduation cards as a personal promise that God has a prosperous plan for your career, your health, your future. It is a beautiful verse, and there is real truth to claim in it, but the popular use skips the sentence right before it, and that sentence changes how you read it.
God is speaking to the people of Judah in exile in Babylon, and the promise is tied to a specific timeline: “After seventy years are completed at Babylon, I will visit you and perform My good word toward you, and cause you to return to this place.” Then comes verse 11. The plans to prosper them were about bringing that generation home after seventy years of discipline. It was not a blanket guarantee that every believer avoids hardship. Many of the people who first heard it would die in Babylon before the return.
What it truly reveals
So what do you actually get from it? Something better than a prosperity slogan. You get a window into the unchanging heart of God. Even while disciplining a wayward people, His thoughts toward them were thoughts of peace and not of evil. That is who He is, in every covenant, in every century. He is not scheming against you. His posture toward His people is good.
And here is where it becomes yours. In Christ, that good heart is not a distant hope with a seventy-year clock on it. Every promise of God finds its yes in Him. The verse read straight is not a promise of a smooth life. Read forward through the cross, it is the assurance that the God who thinks thoughts of peace toward you has already proven it, at Calvary, and He has not changed His mind. Claim it, then, not as a promise of an easy road, but as a window into the God who is unshakably for you and proved it at the cross.