Passage
and there is nothing covered, that shall not be revealed; and hid, that shall not be known;
and there is nothing covered, that shall not be revealed; and hid, that shall not be known;
Luke 12:1 At which time the myriads of the multitude having been gathered together, so as to tread upon one another, he began to say unto his disciples, first, `Take heed to yourselves of the leaven of the Pharisees, which is hypocrisy;
Luke 12:2 and there is nothing covered, that shall not be revealed; and hid, that shall not be known;
Luke 12:3 because whatever in the darkness ye said, in the light shall be heard: and what to the ear ye spake in the inner-chambers, shall be proclaimed upon the house-tops.
Luke 12:4 `And I say to you, my friends, be not afraid of those killing the body, and after these things are not having anything over to do;
The verse centers on "nothing", "covered", "shall", "revealed", and "known". It is saying that the verse draws attention to "nothing" and "covered", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 1's "At which time the myriads of the..." into verse 3's "because whatever in the darkness ye said...", so "nothing" and "covered" belong inside that flow. In Luke context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "nothing" and "covered" with trust shaped by these words, not by a vague optimism outside the passage.