Each tears that had fallen down will moisten the heart, make the dead feeling came to alive. just like the earth that growing the trees after the rain.
But just like the earth to the rain, when the earth is barren like desert, the rain will come down through the earth with no trace. The tears that falling down from the eyes who never see the greatness of God behind every events and His creatures will falling down with no trace in the heart.
As the rain bringing river of alive and flood of death, the tears are both happiness and sadness.