What does the poet Ella Wheeler Wilcox mean by "the sad old earth must borrow its mirth"?

Yes, I support that a mother's love for her children is divine because a mother provides constant love, care, support and protection to her children. Her deep affection and commitment are unconditional. Besides, she puts the needs of her children before her own. Her dedication in the face of challenges, thus, can be perceived as divine.

In the poem "The Sands of Dee", the poet uses vivid imagery to describe Mary's hair. Her hair is described as golden and shining. And no salmon among the stakes of Dee ever seemed brighter than her hair.

The poet calls time an 'old gipsy man' as it has similarities with the gipsies. The gipsies wander from one place to another. Similarly, time goes on. It travels from one city to another and one age to another like an old gipsy man.

In the poem "Time, You Old Gipsy Man", by "Put up your caravan/Just for a day", the poet requests time to pause or temporarily stay for a while. He asks time to rest like a traveler who sets up camp for a short time.

In the poem "Stopping by Woods on a Snowy Evening", the poet stopped by the woods as he was captivated by their beauty and tranquility. He stopped there on a snowy evening. To the poet, it was the darkest evening of the year.

About walking "through the narrow aisles of pain", the poem "Solitude" says that everyone must face pain and hardship alone because sorrows and sufferings are personal and isolating. People have to deal with the difficulties of life alone as nobody wants to share sorrow.