Guardar o rio

One really nice thing about lisbon is the nature of her graffiti. Most places in the world the graffiti say something like

***

or

###

or

$%#!

but here it's mostly... poetry. On my walk yesterday I saw a poem by pablo neruda and this morning this --

(I'm quoting from memory, I have no Portuguese grammar, and my computer refuses to type Portuguese diacriticals, so this is probably jumbled up in more ways than one, but still I am sure you will be able to figure out and correct the mistakes and will still get it:)

It graces a wall overlooking the river and it says

e tao dificil guardar o rio
cuando il corre dentro de nos

And you turn your gaze towards the river and you think to yourself:

E verdad.