Rumi ...

There is a Water that flows down from Heaven
To cleanse the world of sin by grace Divine

At last
Its whole stock spent 
Its virtue gone

Dark with pollution 
Not its own 

It speeds back to the Fountain of all purities

Whence 
Freshly bathed 
Earthward it sweeps again
Trailing a robe of glory bright and pure

This Water is the Spirit of the Saints
Which ever sheds 
Until itself is beggared

God's balm on the sick soul 
And then returns
To Him Who made the purest light of Heaven