No one lights a lantern and covers it with a blanket or puts it in a closet. That would totally negate the purpose of the lantern. The purpose is obviously to give light, to show the way, and to prevent injury by revealing what is hidden in the dark.
At some point, everything will be revealed. So, we need to pay attention to what we learn. Like a lantern, any truth of God is supposed to guide our steps. The most obscure, esoteric piece of theology has a place, an ordering effect, in our hearts. We should take care to reflect on what we learn so we can understand it, obey it and allow it to have the proper effect in our hearts.
How we handle what we learn today affect how God teaches us in the future. They are building blocks. He cannot add higher rows until the lower rows are in place.