What in your life would you fear if anyone found out about it?
What would horrify you if it were exposed before your family, your friends, your acquaintances?
In gospel repentance and faith, we fearlessly expose ourselves to Judgment Day in the present. That’s what the confession of sin is, a revealing of what Jesus already promises to reveal on the Day of Christ (Luke 8:17).
Our problem is that we often, like Adam before us, want to hide our temptations, and especially our sin, to cover it over to save face. Hiding, though, is exactly the opposite of what a Christian does when confronted with satanic designs. The darkness is where these evils latch onto us. Instead we can preemptively shine light on this, with God in prayer and in our authentic accountability to the Body of Christ, his church.
Our Christian reluctance to speak honestly about temptation is precisely why Christians like Felix often believe themselves to be unbelievers. All they see of other believers is this façade of smiling, peaceful Christ-followers. They assume then that the internal life of every other Christian is just a continual festival of hymns as opposed to their own internal life in which the hymns are interrupted with constant gossipy chatter, violent rage, and hard-core pornography.
This is exactly how the satanic powers want it. They want the prideful and oblivious to stay that way, until they fall and slink away in isolation, where they can be devoured.
Preaching the gospel to ourselves, though, reminds us continually that we are sinners and that we can stand only by the blood of Jesus. We can walk only by his Spirit prodding us on. We need one another, as parts of the same body together.