"No one who lights a lamp conceals it with a vessel or sets it under a bed; rather, he places it on a lampstand so that those who enter may see the light. For there is nothing hidden that will not become visible, and nothing secret that will not be known and come to light. Take care, then, how you hear. To anyone who has, more will be given, and from the one who has not, even what he seems to have will be taken away." (Lk 8:16-18)
Any one lights a lamp to keep in a central place to give light to all and everywhere. Light is lit only where it is night or when one is in dark. The purpose is to light up the place so that no one goes lost in the dark. So light will not be kept in a vessel or under bed to hid it. Its main purpose is to be in the open to be visible and to make things visible.
Nothing in the world is secret. Nothing is created for secret. Whatever may be the secret it will be made visible one day. Everything will come to light one day. Through revelation God who is considered to be hidden is constantly made visible. Jesus himself has come into the world to reveal the kingdom and God. There will not be any secrets.
“To anyone who has, more will be given, and from the one who has not, even what he seems to have will be taken away." This is a cryptic saying which when expanded would read as follows: “To anyone who has (made more out of what is given him) more will be (given) and from the one who has not (made anything out of what is given to him) even what he seems to have will be (as if ) taken away.