Why is it people will complain, when they have an open door, where they can walk out to and gaze the stars; rather than having a closed door to lock them in?

When one door is closed, don't you know, another is open.

People are complaining of having rags and not riches, but I find it a blessing just to have rags, to wipe away the dirt and dust that may come in the course of life.

The brain has only three functions: open, closed, or deprived.

It seems when Opportunity knocks, Fate shows up to open the door.

I have an open-door policy.