why is Jaques sad??

I need to find out more about it..:)

I forget, but Harold Bloom talks about this in his "Shakespeare: Invention of the Human." Something to do with the fact that Jaques has had a, lets say, worldly past, from which he has matured, now to a point of detatchment and asceticism perhaps. Check out Bloom for the elaboration on this.

Yeah you are probably right..because i read something about experience Jaques had..Thanks anyway :)

Yeah, he seems like a libertine whose wild past has caught up with him. Also genuinely wise despite the Duke's critique of his somewhat dramatic and existentialist manner, I think both play a part in his sadness to some exstent.