Into each life some rain must fall

Into each life some rain must fall,
days must be dark and sad and dreary
But after any rainy day,
the sky is clearer and our soul smile ahead
with rainbow left into each other heart,
whatever the morrow will be.
And the dark and dreary may wait
for yet another time for the rainbow to fade.

*The rain has long fallen into our lives, for how long? Do you recall?*