Tim Keller wrote, "There are two ways to read the Bible. One way to read the Bible is that it’s basically about you: what you have to do in order to be right with God, in which case you’ll never have a sure and certain hope, because you’ll always know you’re not quite living up. You’ll never be sure about that future. Or you can read it as all about Jesus. Every single thing is not about what you must do in order to make yourself right with God, but what he has done to make you absolutely right with God."
When it comes to being right with God, Keller made it clear. It's all about Jesus. It's not what we have done, but what Jesus has done for us. That's the Gospel (Romans 1:16). Yes, it's all about Jesus. He died for our sins. He is risen from the dead. He is Lord (Romans 10:9).
It's all about Jesus, not about doing better nor trying harder. Rather, it's simply resting by faith in Jesus Christ who is our righteousness with God. The only way that we can be right with God is in Christ alone (2 Corinthians 5:21; John 14:6; Acts 4:12).
When it comes to being sure you are right with God, it's all about Jesus. Assurance is not about what we have done nor what we will do. It's all about what Jesus has done for us and what He is doing in us. Tim Keller was right. The focus of our faith must be in Christ alone. He works in us what is pleasing to God (Hebrews 13:21).
