Luke 12:2-3

Nevertheless what is now unknown because of hypocrisy will one day become known. This is a general principle. On the human level there are exceptions to this principle, but Jesus undoubtedly had God who knows all secrets in mind. Luke 12:3 probably is a positive encouragement rather than an ominous threat. Jesus used it that way in the other contexts in which He made this statement (cf. Luke 8:17; Matthew 10:26-27; Mark 4:22). If so, He meant the good witness that the disciples might try to hide because of the threat of persecution would come out into the open eventually.