Ah, the moon is fully radiant. Its cool sweetness is the root of happiness.

This couplet beautifully captures the serene joy of a full moon. Imagine gazing at the moon, completely radiant and round, almost like a flower that has fully bloomed. The poet exclaims "Aaha!", expressing pure delight. The moon's light isn't just bright; it's described as possessing a "cool sweetness," a gentle and pleasant aura that brings immense comfort and peace. This soothing brilliance is presented as the very source of happiness, making one feel content and blissful. It's an appreciation of nature's simple yet profound beauty and the tranquility it bestows upon us.