why can' faeries lie

.it in part goes back to the old belief that oaths had power, and that to break one was to break certain rules of both society and religion- certain powerful beings were ascribed the inability to lie, as it was their job to enforce oaths.. hence swearing by whatever god, through the ages.... also, certain evil powers, down through the chrisitan devil, have been known as the father or mother of lies....

"Why Can't Faeries Lie?" Titled Forum Project. N.p., n.d. Web.