The gospel is not only the way to enter the kingdom; it is the way to live in the kingdom.
Our moral efforts are too feeble and falsely motivated to ever merit salvation.
The cross is the place where the Judge takes the Judgment.
The main problem in the Christian life is that we have not thought out the deep implications of the gospel, we have not 'used' the gospel in and on all parts of our life.
Are you living to justify yourself, or are you living because you are justified?
A Christian is one who stops working to be saved, not one who stops working!