When we talk about propitiation, we're talking about what the blood of Jesus did for the Father. He satisfies the demands of God's justice. In propitiation, the atonement of Christ is looking towards the Father, to satisfy His justice, to satisfy His holiness, that the Father may be just and the justifier. So propitiation looks toward that action of satisfaction that the atonement of Christ accomplishes. But it does more than that.
By R.C. Sproul
When we talk about propitiation, we're talking about what the blood of Jesus did for the Father. He satisfies the demands of God's justice. In propitiation, the atonement of Christ is looking towards the Father, to satisfy His justice, to satisfy His holiness, that the Father may be just and the justifier. So propitiation looks toward that action of satisfaction that the atonement of Christ accomplishes. But it does more than that.