That is Arabic not Farsi ! They just have almost the same Alphabet. A possible translation ( not very accurate though): "When a man sinks in despair , he becomes insulting and acts like a defeated cat shouting at a dog."

Hey Ali.You're welcome! You have written your question(question about "dude" in a wrong place.I didn't receive any notification for that,I saw that accidentally. And about that "hey dude";it means "hi friend" or something like that.Can you understand English? Well,can I ask you a question?Why did you want to know the meaning of that sentence?I think it's from a tale from our Saadi's Golestan,huh?Are you reading Golestan?

Hey dude.This sentence is not Farsi,it's Arabic.Do you still need its translation?