"How dare you approach the mercy-seat of God on the basis of what kind of day you had..."

How dare you approach the mercy-seat of God on the basis of what kind of day you had, as if that were the basis for our entrance into the presence of the sovereign and holy God? No wonder we cannot beat the Devil. This is works theology. It has nothing to do with grace and the exclusive sufficiency of Christ. Nothing. 

Do you not understand that we overcome the accuser on the ground of the blood of Christ? Nothing more, nothing less. That is how we win. It is the only way we win. This is the only ground of our acceptance before God. If you drift far from the cross, you are done. You are defeated. 

We overcome the accuser of our brothers and sisters, we overcome our consciences, we overcome our bad tempers, we overcome our defeats, we overcome our lusts, we overcome our fears, we overcome our pettiness on the basis of the blood of the Lamb.

— D. A. Carson, Scandalous: The Cross and Resurrection of Jesus, 103