There are so many doors to open. A very little key will open a very heavy door. A little "thank you" that you will say to someone for a "little favour" shown to you is a key to unlock the doors that hide unseen "greater favours". There is so many things you can do with the doors, you can open, close, knock, break...I think if you are curious, you create opportunities, and then if you open the doors, you create possibilities. And then there is this one most important door, Door to Heaven!