The future doesn't exist until you create it with your choices. There's only one way. Isaiah is the most important prophet of the Old Testament, because throughout his book he speaks for God about the coming of the messiah. Through Scripture, God communicates Himself to humanity. But there's a key difference between the Old Testament and the New Testament.
Every good father knows that personal example is the most powerful teacher.
And so it is with God, who is our Father in heaven. In the Old Testament, God tells us who He is and how we should live. In the New Testament, He shows us who He is and how we should live, in the person of Jesus, His son. God becomes the flesh and blood of a man who is just like us in everything, except sin. When we look at Jesus, we see all of Sacred Scripture alive and breathing.