Lyric discussion by N63 

Cover art for Mad The Swine lyrics by Queen

Mad the swine is referencing the time when a heard of pigs were given the evil spirits of a possessed man. At that time they all went nuts and ran into the river and drowned. The man was healed and hence the title mad the swine.

Beyond that and as a Christain it illustrates just how Jesus can work within a life to save us and the many means by which he will and can rid us of our evils...and we've many