"By Mammon is meant the devil who is the Lord of Money" wrote Thomas Aquinas. AVARICE is a worldly sin that creates misers, thieves and murderers. The wolf is the animal usually depicted in medieval bestiaries, coming up from hell carrying Mammon to inflame the human heart with Greed.
Like the "hungry ghosts" of the Buddhist hell, the greedy always crave more no matter how much they have. Wretched and envious, Avarice escalates to a state of infinite dissatisfaction and the sin's obsession with material wealth and "things" leads to neglect of spiritual wealth. The opposing virtue to Avarice is Sufficiency.