Here’s a couple of great quotes from Grace Alone: How the Grace of God Amazes Me by Sinclair B. Ferguson.

Being amazed by God’s grace is a sign of spiritual vitality. It is a litmus test of how firm and real is our grasp of the Christian gospel and how close is our walk with Jesus Christ. The growing Christian finds that the grace of God astonishes and amazes.

We do not become sinners by committing specific acts. We commit specific acts of sin because we are sinners. In short, my problem is not the isolated actions that I see as aberrations from what I really am. I am deceiving myself if I think that way. These actions are not aberrations but revelations of what is in my heart. They show that I commit sin because I am in bondage to it.

Here, then, are two sure signs that our religion, even if we call it Christian, is not the real thing. We are not made happy by seeing the grace of God touch the lives of needy men and women so that they are brought to faith in Jesus Christ, and we neither see nor feel any special need for forgiveness for ourselves. We do not see ourselves as “one of nought.”

What Christ is doing in you is still incomplete. But in what Jesus Christ has done for you there is not a single tiny crack that the satanic arrows can penetrate.