While flying recently, I watched a mother and her children a few rows ahead of me. While the toddler played contentedly, the mother gazed into the eyes of her newborn, smiling at him and stroking his cheek. He stared back with a wide-eyed wonderment. I enjoyed the moment with a touch of wistfulness, thinking of my own children at that age and the season that has passed me by.

I reflected, however, about King Solomon’s words in the book of Ecclesiastes about “every activity under the heavens” (v. 1). He addresses through a series of opposites how there is a “time…