http://www.perseus.tufts.edu/cgi-bin/ptext?lookup=Aeschin.+3+171
But he was wrong. Demosthenes was a proud Athenian, but he couldn't see the future of Greeks without Athenian domination! He wasn't a Philhellene !!
Let me tell you as well that the meaning of the word "barbarian" had changed by the times of Demosthenes:
http://www.perseus.tufts.edu/cgi-bin/ptext?doc=Perseus%3Atext%3A1999.04.0057%3Aentry%3D%2319347
Istor
Ethnic Macedonians were always Greek