Here's a breakdown of the possible meanings:
* Ephemerality of Joy: Sweetness represents joy, happiness, and pleasant experiences. The phrase implies that these moments are fleeting, like a taste of sweetness that disappears on the tongue. Nothing good lasts forever.
* Growth and Evolution: Life is a journey of constant change. While something may be sweet and enjoyable now, it might transform or evolve into something different. This change isn't necessarily negative, but it highlights the ever-shifting nature of life.
* Appreciation for the Present: The phrase encourages us to savor the sweetness while it lasts, recognizing that it won't be permanent. It's a reminder to appreciate the present moment and not take sweetness for granted.
* The Cycle of Life: Sweetness can also symbolize the joys of youth, love, and innocence. The phrase alludes to the natural cycle of life, where even the most beautiful seasons eventually give way to others.
Ultimately, the meaning of "change in all things sweet" is open to individual interpretation. It's a poetic statement that captures the melancholy beauty of impermanence and the wisdom of embracing both the sweet and the bittersweet in life.