This is from The Gulistan (Rose-Garden) of Sa'di, the medieval Persian poet:
 
"I remember having once walked all night with a caravan and then slept on the edge of the desert. A distracted man who had accompanied us on that journey raised a shout, ran towards the desert and took not a moment's rest. When it was daylight, I asked him what state of his that was. He replied: 'I saw bulbuls commencing to lament on the trees, the partridges on the mountains, the frogs in the water and the beasts in the desert so I bethought myself that it would not be becoming for me to sleep in carelessness while they all were praising God.'

Yesterday at dawn a bird lamented,
Depriving me of sense, patience, strength and consciousness.
One of my intimate friends who
Had perhaps heard my distressed voice
Said: 'I could not believe that thou
Wouldst be so dazed by a bird's cry.'
I replied: 'It is not becoming to humanity
That I should be silent when birds chant praises.'

 
I love this guy! He has a sort of Blakean heedlessness and joy to him, and after reading a bunch of Zoroastrian treatises on good behavior (not very different from Confucian or Greek or Latin treatises about good behavior: they are all big on moderation and dignity and self-restraint), he came as a wonderful breath of fresh air for me...

Here's another taste for you:

Who has renounced appetites for the sake of approbation by men has fallen from licit into illicit appetites.