Until God opens the next door, praise him in the hallway. I think this quote is just a cliche and doesn't mean much to anyone until they find themselves in a hallway and see how difficult it can be to trust and praise God in times of waiting.
spiritualinspiration: “ Much of life is spent waiting. It’s how we wait that makes all the difference. Psalm says “Each morning I bring my requests to you and wait expectantly.” Waiting with expectancy means instead of worrying if God is going to.