The significance of the title

I quite liked A Thousand Splendid Suns. Infact, in the post below I wrote about some bits I found interesting. But, I'm still very confused about the title. I don't quite understand the real meaning/significance of it.

Now, it's mentioned a couple of times. Once when Laila thinks of returning to Kabul. This is when she remembers two lines from a poem -

"One could not count the moons that shimmer on her roofs,
Or the thousand splendid suns that hide behind the wells".

I was going through a translated version of that poem on wikipedia earlier, and the poem was talking about the beauty and brightness of Kabul.

Later on the phrase is repeated when Laila thinks of Mariam. The line goes, "But mostly, Mariam is in Laila's own heart, where she shines with the bursting radiance of a thousand suns".

Does it signify the idea that amidst all this hopelessness, suffering and fear is hope, happiness and love? Like the bright side of things, the things we can become?