That mirror of beauty is displaying their radiant splendor, while I am overcome with such shame that I do not know how to show my face.

Here, the poet captures a feeling of utter humility and awe in the presence of overwhelming beauty. The beloved is depicted as a radiant 'mirror of grace,' reflecting a perfection so dazzling that the lover instantly feels conscious of their own flaws. It is that tender, relatable hesitation where divine purity makes an ordinary, imperfect heart feel unworthy to even look up and show its face.