There is more out there you have not seen that you have seen
There is way more things out in the universe that is not seen, that we nor anyone will ever see because it has already happened or no one was looking when it did happen. If we are lucky we can catch glimpses through historical accounts or through instruments such as the Hubble telescope. Knowing that this is true, that there is more we have not seen than seen leads us to a conclusion that this verse points out that the unseen is eternal and the seen is temporary. And we have historical accounts of God and people seeing him. More realistically, seen very small specific aspects of him, because no man shall look on the face of God and live. If you mind hurts take an advil.
Created 8 months ago