Why, according to the poet, is beauty a joy forever?

According to the poet in “A Thing of Beauty,” beauty is a “joy forever” because it provides lasting happiness and comfort to the soul. Keats suggests that beautiful things, whether in nature or art, have an eternal, unchanging quality that continues to bring joy long after the moment has passed. Beauty never fades or loses its significance; it becomes a permanent source of pleasure and peace. In this way, beauty is immortal, constantly offering solace and inspiration, regardless of the challenges or sorrows of life.

This question related to Poem 3 English Flamingo Class 12th NCERT.
From the Poem 3. A Thing of Beauty.
Give answer according to your understanding.