That verse comes from the parable of the seed and the sowers wherein Jesus is preaching about evangelism, planting seeds that bear fruit, when he says:

He said to them, “Do you bring in a lamp to put it under a bowl or a bed? Instead, don’t you put it on its stand? For whatever is hidden is meant to be disclosed, and whatever is concealed is meant to be brought out into the open. If anyone has ears to hear, let them hear.”,

Jesus is exhorting his followers not to hide the light of God that is in their hearts, but to let it shine, to be beacons of hope to the world, to spread the word. He's telling them, "what are lamps for? for putting them under a bowl or under a bed? No! lamps are for lighting up rooms, for letting you see what you couldn't see before!". It's part of a sermon on evangelism that begins in verse 1 and ends in verse 34.

We could get into theological discussions about whether "what is hidden" had more significance; whether it is sin people need to repent from, or the spiritual world that people need to be awakened to, or if it is referring to discovering whether the person who was evangelized was among the elect or not. There are quite a few interesting views we could explore in that verse. But yours is not one of them. Yours is one that requires we pretend that statement was made in a vacuum as opposed to being in the middle of a sermon about evangelism.