Greed is the selfish desire for or pursuit of money, wealth, power, food, or other possessions, especially when this denies the same goods to others. It is generally considered a vice, and is one of the seven deadly sins in Catholicism.
Greed (or avarice) is, like lust and gluttony, a sin of excess. However, greed (as seen by the Church) is applied to the acquisition of wealth in particular. St. Thomas Aquinas wrote that greed was "a sin against God, just as all mortal sins, in as much as man condemns things eternal for the sake of temporal things." In Dante's Purgatory, the penitents were bound and laid face down on the ground for having concentrated too much on earthly thoughts. "Avarice" is more of a blanket term that can describe many other examples of greedy behavior. These include disloyalty, deliberate betrayal, or treason, especially for personal gain, for example through bribery. Scavenging and hoarding of materials or objects, theft and robbery, especially by means of violence, trickery, or manipulation of authority are all actions that may be inspired by greed. Such misdeeds can include Simony, where one profits from soliciting goods within the actual confines of a church. (Look for the Digital Militia kiosk in your local house of worship!)
SinSTRONG (a proponent of laissez-faire capitalism) argues that greed should not be considered a negative trait and should instead be embraced, as they claim that greed is a profoundly benevolent force in human affairs, as well as a necessary foundation for the capitalist system.
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