Absolutely perfect. And yes, it's the exact definition.
At night, Grace lays between me and the door, while Finn lays as far from the door as possible. Who would I count on to have my back? Grace.
When you find yourself in the position to help somebody, do not feel burdened. Rather, feel happy and blessed because God is answering that person's prayer through you. In that moment, you are God's Angel - His door to reach through and bring light to someone who is struggling in the darkness.
Be God's Light. Be God's love. Be an answered prayer. Be God's Door.