John 16:33 ‘I have told you these things, so that in me you may have peace. In this world you will have trouble. But take heart! I have overcome the world.’
What an awesome thing to understand and have complete faith in; that Christ has already overcome the world so that we do not have to worry about what it can do to us!
That does not mean that you should not be scared of fire – it is still hot and will still burn you! What is being said is that no matter what the world throws at you, all it can do to you is just physical.
God is the one who holds your soul safely in His hands with a firm grip that will never let go or falter!