While at Athens, the multitude of altars and temples, and the devotion paid to them, stirred his spirit, so that he could not but speak out plainly, and point to the truth.  It seemed a new philosophy to the talkers and inquirers, who had talked to shreds the old arguments of Plato and Epicurus, and longed for some fresh light or new interest; and he was invited to Areopagus to set forth his doctrine.  There, in the face of the Parthenon and the Acropolis, with philosophers and students from all parts of the empire around, he made one of his greatest and noblest speeches—“Ye men of Athens, I perceive that in all things ye are greatly religious.  For as I passed through your city, and beheld how ye worship, I found an altar with this inscription—‘TO THE UNKNOWN GOD.’ Whom, therefore, ye ignorantly worship; Him declare I unto you.”