Identifying Author's Tone in Childhood Reflection

In the following excerpt, the author reflects on the passage of time during a childhood summer:

"As I sat in the backyard, the sun warming my face, I felt as if the world had paused. The laughter of my friends echoed in the air, harmonizing with the soft rustle of leaves. Time seemed to melt away, turning each moment into an everlasting memory. Those carefree days, filled with innocence and joy, were like treasures that I knew would someday fade, yet they brought a comfort that followed me into adulthood."