This, my friends, is a lie.
You secret sin effects the body of Christ. It breaks it down. It weakens it. You've put a breach in the wall.
Confess your sin, repent, and find accountability. Hide no more! Being secretive about your sin will eat at your body like cancer. Do whatever you can to remove that "cancer"! Get radical about purging sin from your life, your body, your mind.
Life your life in the power of the Holy Spirit, blameless and pure before our Almighty God!