My youngest grandson is only two months old, yet every time I see him I notice little changes. A few weeks ago as I cooed to him, he looked up at me and smiled! And suddenly I began crying. Perhaps it was joy mixed with remembering my own children’s first smiles, which I witnessed so long ago, and yet it feels like just yesterday. Some moments are like that—inexplicable.

In Psalm 103, David penned a poetic song that praised God while also reflecting on how quickly the joyful moments of our lives pass by: “The life of mortals is like…