Oh, one sweet thing, possessing even the greenish hue of the waters filling the great ocean.

This line beautifully paints a picture, starting with a tender exclamation, 'Oh, how sweet!' It then draws our eyes to the vast, endless ocean, specifically highlighting the beautiful greenish color of its deep waters. It evokes a feeling of profound sweetness or affection, as boundless and captivating as the ocean itself. It suggests that something precious and lovely is being observed, its beauty compared to the serene, green expanse of the sea, creating a sense of calm wonder and deep appreciation.