God is so gracious! He really is even when we look at a passage like 1 Timothy 5.24-25: The sins of some men are obvious, reaching the place of judgment ahead of them; the sins of others trail behind them. In the same way, good deeds are obvious, and even those that are not cannot be hidden (5.24).
You see, sin is so deceitful that we can believe we have begun to beat God at His game - we can continue to live in sin and serve God. But God in His grace loves us so much that He essentially says, I know what is going on and just because the sin that you are hiding has not been found out yet, it will if you continue in it. And so God in His grace warns us - stop your hidden sins or they will find you out. Any hidden sins?
But there is more. Covering up sins is tiring. We need to constantly look over our shoulder to see if anyone is looking or worse, we need to remember the lies we have told. Satan is so deceitful in that he is able to convince us that the supposed pleasure, which is wiping us out, is satisfying! And God intervenes in grace and says Come to me, all you who are weary and heavy laden, and I will give you rest.
If you are hiding sins, ask God to give you grace to deal with them. You will find forgiveness and the power of the Holy Spirit to give you power to confess and repent. Come to Jesus and you will find rest. However, if you choose to continue to hide your sins, know God's Word: and even those that are not cannot be hidden. In God's grace, He has warned you!