User blog comment:ImperiexSeed/Supernatural Mysteries/@comment-3481504-20120404154634/@comment-1509826-20120408182335

that's not entirely true, Azazel was able to permform deals without taking the persons soul, so he clearly had the power to manipulate reality without the need for it. But for all others demons (except maybe Crowley now he has all of hells resources under his loose comand) that is true.