Yes, that is the core sentiment of the line. It suggests that beautiful things have a lasting and eternal impact, providing joy that doesn't diminish over time.
Here's a slightly more nuanced understanding:
* Forever doesn't necessarily mean literal immortality: It suggests the joy derived from beauty remains imprinted on the mind and spirit, influencing our experience and outlook long after the immediate encounter.
* Beauty is subjective, but potent: While individual experiences of beauty may vary, the potential for lasting joy resides in all things that evoke it.
* Beauty transcends the physical: It's not just about visual aesthetics; it can encompass experiences, actions, ideas, and emotions that inspire awe, wonder, or deep appreciation.
In conclusion, "A thing of beauty is a joy forever" is an affirmation of the enduring power of beauty to enrich our lives and leave an indelible mark on our souls.