Angels
Known for their appearances in the bible. But today we use angels to help us, guide us and heal us. We don't have to be religious to believe in angels.
There are many reports of angelic assistance be it a voice, visions or white feathers which appear to come from no where! If you have asked for their assistance you will know that they sometimes work in bizarre ways! Maybe your car won't start that day? And that can be frustrating, when you want to go somewhere or have to be some where. So you call the recovery service? And your car starts without a problem or explanation as to why it would not start in the first place. Then you discover that on the route you were going to take there had been a nasty car accident. So were you prevented from leaving the house at that time by angels?
This is just one example of how angels can help us. If it is a life threatening situation they will step in, if its not your time to leave the physical. However unless this occurs angels cannot assist us until we ask for their help. This is because we all have free will, the law of free will prevents the angels from helping us, if we do not want angelic or any kind of spiritual help then this will not occur. It would be like you learning to build a model, and you were determined to go it alone and teach yourself. If someone stepped in and offered you help you would not want it. If they persisted you would not appreciate it, if you had already decided to learn yourself. And this is an example of how the angels work.