We know that if the life we live here on earth is ever taken down like a tent, we still have a building from God. It is an eternal house in heaven that isn't made by human hands.
In our present tent-like existence we sigh, since we long to put on the house we will have in heaven.
After we have put it on, we won't be naked.
While we are in this tent, we sigh. We feel distressed because we don't want to take off the tent, but we do want to put on the eternal house. Then [eternal] life will put an end to our mortal existence.
God has prepared us for this and has given us his Spirit to guarantee it.
So we are always confident. We know that as long as we are living in these bodies, we are living away from the Lord.