Isaiah 43:1-3  

I can hardly think of more beautiful words in all of the old testament from God to his people. To say to his people and then just to think about these realities in our own lives right now, through Christ. So obviously it’s not the exact same when God is speaking to Jacob in Israel here in this context, but these are truths,realities we know God has spoken to us, to all who have trusted in Christ as a part of the church – the people of God 
When you walk through fire you will not be burned. Now, let this soak in, what he’s saying here. He’s not saying that as his people, as his sons and daughters, his children, that things are going to be easy for us in this world. He’s  talking about passing through waters and through rivers. He says when you walk through fire, not if you walk through fire, he’s saying, you’re gonna walk through fire. You’re going to pass through rivers. Things are not always going to go well for you.