The poets spend the night in this valley with Sordello and other spirits. In the morning they ascend to the gates of the real Purgatory. These are kept by an angel deputed by St. Peter. Ashes, or earth taken dry out of the ground, Were of one colour with the robe he wore. From underneath that vestment forth he drew Two keys, of metal twain: the one was gold, Its fellow silver. With the pallid first, And next the burnish'd, he so ply'd the gate, As to content me well. "Whenever one Faileth of these, that in the key-hole straight It turn not, to this alley then expect Access in vain." Such were the words he spake. "One is more precious[1]: but the other needs, Skill and sagacity, large share of each, Ere its good task to disengage the knot Be worthily perform'd. From Peter these I hold, of him instructed that I err Rather in opening, than in keeping fast; So but the suppliant at my feet implore." Then of that hallow'd gate he thrust the door, Exclaiming, "Enter, but this warning hear: He forth again departs who looks behind." As in the hinges of that sacred ward The swivels turn'd sonorous metal strong, Harsh was the grating, nor so surlily Roar'd the Tarpeian, when by force bereft Of good Metellus, thenceforth from his loss To leanness doom'd. Attentively I turn'd, Listening the thunder that first issued forth; And "We praise thee, O God," methought I heard, In accents blended with sweet melody, The strains came o'er mine ear, e'en as the sound Of choral voices, that in solemn chant With organ mingle, and, now high and clear Come swelling, now float indistinct away. [1] One is more precious. The golden key is the divine authority by which the priest gives absolution. The silver stands for the learning and wisdom necessary for the priest. IV. Beatrice Appears to Dante and Rebukes Him. From the Purgatorio. Inside the gates of Purgatory rise seven successive circles, in which the seven deadly sins are purged; in the first, the sin of pride; in the second, that of envy; in the third, anger; in the fourth, lukewarmness; in the fifth, avarice; in the sixth, gluttony; in the seventh, incontinence is purged by fire. Having passed through all these, Dante and his guide ascend to the summit of the mountain, the earthly Paradise. Here Virgil ceases to guide the poet, but leaves him to choose for a while his own way. To him here descends Beatrice who, before assuming his further guidance, rebukes him for his manner of life on earth.