I'm not a satanist, but I find this interesting - The Nine Satanic Sins (Note: when he mentions "magic" he's not actually speaking of spellcasting, etc. It's a nickname for a type of psychological manipulation expounded upon in the book).
Alex Shaw shares: A feather is a gift from the spirit world. If you see one, undamaged by the elements, pick it up. You will be blessed that day through. Many people believe that Angels visit, leaving feathers as proof.