Ask HN: Can someone solve this mystery for me about a saying at JFK's funeral?

I have been trying to figure out if this is a poem and if so, who wrote it. In the video, https://www.youtube.com/watch?v=3KJQkn6zUvM, the saying starts from 1:40 - 3:46. It starts There was a sound of laughter and in a moment it was no more...

If it is not a poem, can someone tell me what that is about? To add to my confusion, a poster in the comment section said "the ring was returned to her in Bethesda" Ok, so did something happen?