Do you feel like your holiness effects anyone?
Maybe you think your secret sin isn't really causing anyone else problems, so you'll just keep it there, locked away?
How can the body of Christ not be effected by personal hidden sin? We're all the body of Christ and this is why humility, grace, revival, and honesty must be apart of our walk with fellow believers.
You know when you have a small hangnail on your toe and it effects how you walk because of the small pain. Well a day or two of walking "funny" your legs hurt, your back aches, and you feel out of sorts.
Yes, your little sin may be "small", but it does effect the entire Body! May we be open, honest, and transparent so our hidden sins don't effect the Church!