Dante Alighiere, PURGATORIO, Canto XVII

Illustration by Salvador Dali
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The Poet issues from that thick vapour; and soon after his fancy represents to him in lively portraiture some noted examples of anger. This imagination is dissipated by the appearance of an angel, who marshals them onward to the fourth cornice, on which the sin of gloominess or indifference is purged; and here Virgil shows him that this vice proceeds from a defect of love, and that all love can be only of two sorts, either natural, or of the soul; of which sorts the former is always right, but the latter may err either in respect to object or of degree.