Meaning: The truth of a matter will ultimately be revealed.
Mark 4:22
For there is nothing hid, which shall not be manifested; neither was any thing kept secret, but that it should come abroad.
Luke 12:3
Therefore whatsoever ye have spoken in darkness shall be heard in the light; and that which ye have spoken in the ear in closets shall be proclaimed upon the housetops.
2 Samuel 12:12
For thou didst it secretly: but I will do this thing before all Israel, and before the sun.