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Sloth/Laziness (Latin, acedia)
Main articles: Sloth (laziness, sadness, apathy)
More than other sins, the definition of Sloth has changed considerably since its original inclusion in the list. It has been characterized as what modern thinkers would describe as apathy, depression, and joylessness — the latter being considered a refusal to enjoy the goodness of God and the world he created. Originally, its place was fulfilled by two others, Acedia and Sadness. The former described a spiritual apathy that affected the faithful by discouraging them from their religious work. Sadness (tristitia in Latin) described a feeling of dissatisfaction or discontent, which caused unhappiness with their current situation. When Aquinas selected Acedia for his list, he described it as an "uneasiness of the mind," being a progenitor for lesser sins such as restlessness and instability. Dante built on this definition, describing Sloth as being the "failure to love God with all one's heart, all one's mind and all one's soul." He also describes it as the middle sin, and as such is the only sin characterised by an absence or insufficiency of love. The advent of psychiatry and a greater understanding of mental health beginning in the 19th century resulted in a more sympathetic attitude to this behavior, which is now understood to be manifestations of depression or anxiety disorder that are beyond the control of the "sinner". Modern interpretations portray Sloth as being simply a sin of laziness, of an unwillingness to act, and of an unwillingness to care. For this reason Sloth is now often seen as being considerably less serious than the other sins.