1 In the meantime, when so many thousands of the people had gathered together that they were trampling one another, he began to say to his disciples first, “Beware of the leaven of the Pharisees, which is hypocrisy.
2 Nothing is covered up that will not be revealed, or hidden that will not be known.
3 Therefore whatever you have said in the dark shall be heard in the light, and what you have whispered in private rooms shall be proclaimed on the housetops.
Secrets revealed in this life (1 Corinthians 14:25, Acts 5:3) or on the Day of Judgment (Romans 2:16, 1 Corinthians 4:5)
1 Corinthians 14:25
25 the secrets of his heart are disclosed, and so, falling on his face, he will worship God and declare that God is really among you.
3 But Peter said, “Ananias, why has Satan filled your heart to lie to the Holy Spirit and to keep back for yourself part of the proceeds of the land?
16 on that day when, according to my gospel, God judges the secrets of men by Christ Jesus.
1 Corinthians 4:5
5 Therefore do not pronounce judgment before the time, before the Lord comes, who will bring to light the things now hidden in darkness and will disclose the purposes of the heart. Then each one will receive his commendation from God.
Some sins dealt with before, some after (1 Timothy 5:24-25, Matthew 6:4, 6)
1 Timothy 5:24-25
24 The sins of some people are conspicuous, going before them to judgment, but the sins of others appear later.
25 So also good works are conspicuous, and even those that are not cannot remain hidden.
Matthew 6:4, 6
4 so that your giving may be in secret. And your Father who sees in secret will reward you.
6 But when you pray, go into your room and shut the door and pray to your Father who is in secret. And your Father who sees in secret will reward you.
But all will be judged (Ecclesiastes 12:13-14) and lying tongues will not last forever (Proverbs 12:19).
13 The end of the matter; all has been heard. Fear God and keep his commandments, for this is the whole duty of man.
14 For God will bring every deed into judgment, with every secret thing, whether good or evil.
19 Truthful lips endure forever, but a lying tongue is but for a moment.