“To show how a text fits into its whole canonical context, then, is to show how it points to Christ and gospel salvation, the big idea of the whole Bible. Every time you expound a Bible text, you are not finished unless you demonstrate how it shows that we cannot save ourselves and that only Jesus can. That means we must preach Christ from every text, which is the same thing as saying we must preach the gospel every time and not just settle for general inspiration and moralising.”
Tim Keller, Preaching, Viking, 2015, pg 48.