Psalm 41:6 And if he comes to see me, he speaks lies; His heart gathers iniquity to itself; When he goes out, he tells it.
We can see who our enemies are by the way the act towards others and not just ourselves. We can see who the enemies of Christ are in a similar way.
If we can see them so easily then God has no problem spotting them a mile off.
We may have to wait for people to say something out of sorts or to do something wrong before we spot they are not good. Christ has the foreknowledge to see who is willing to ask for His forgiveness.
You don’t have to wait until God tells you off – ask for forgiveness now.