The efforts of the great preacher were crowned with success. A very large number of the faithful were present in the church when the new festival was celebrated. The sermon which Chrysostom delivered on the occasion has happily come down to us.[299] In the introduction he says he wished to speak to them himself concerning the festival over which there had been so much controversy in Antioch. Some considered it a mere innovation, but others knew that it was observed in the West from Thrace to Cadiz. This last assertion was an exaggeration, as the next words of Chrysostom themselves show. He says he proposes to commend the feast to the devotion of his hearers on three grounds: first, because the feast has spread with remarkable rapidity, and has met with so much favour in all directions;[300] secondly, because the time of the census taken in the year of Christ’s birth can be determined by ancient documents preserved in Rome; thirdly, the year of our Lord’s birth can be computed from the time of the angel’s appearance to Zachary in the Temple. Zachary, as High Priest, had entered into the Holy of Holies on the Day of Atonement. The Jewish Day of Atonement fell in September. Six months afterwards the angel came to Mary, and nine months later Christ was born, _i.e._ in December. Chrysostom concludes with an attack upon those who do not believe in the incarnation of the Son of God. All this, however, as far as the determination of the date is concerned, rests upon an insecure foundation. Since Zachary was only an ordinary priest, and not the High Priest, his entry into the Holy of Holies cannot therefore be identified with that of the High Priest on the Day of Atonement. But this is of little importance, if on independent grounds these calculations could still point to the month of December, though the 25th need not on this account have been the precise day on which our Lord was born. When we consider the facts, we see that it was no mere accident that Christmas began to be celebrated in the East just at this particular period, and that its introduction was due to the influence of the great men whom we have named.