Doors are passageways. They are symbolic of a transition. When Divine opens the door for you, you know your purpose awaits and you are inclined to walk through it with excitement.
Seek your God-given door and embrace your destiny. Your waiting patiently is over.
Because you have kept my word about patient endurance, I will keep you from the hour of trial that is coming on the whole world, to try those who dwell on the earth. Revelation 3:10