What does Isaiah 45:21 mean?

Speak up and present your case. Let them consult together. Who predicted this long ago? Who told it from the start? Wasn’t it me, the Lord? There’s no other God but me—a God who does what’s right and saves. Isaiah 45:21 - Modern Text Bible

(God challenges anyone to prove they predicted these events. Only He could do it, showing He’s the only true God who saves.)