Alcuin of York — on Rev 21:21 (QUESTIONS AND ANSWERS MANUAL ON REVELATION)

“THERE FOLLOWS: And the street of the city was pure gold, as it were transparent glass. ANSWER: He makes the streets of the same materials as those he had previously said the city was adorned with, for there are many people in the Church who, even leading a less strict and inferior life, are endowed with the greatest virtues, and shine with both purity of mind and the radiance of work.”