The Orthodox Faith is Already Sealed

“The Orthodox Faith is already “fulfilled” and “sealed” and not accepting neither lessening nor adding nor any other alteration and anyone that would dare to commit or advise or think about this has already denied the Faith of Christ, has already come under the eternal anathema by blaspheming the Holy Spirit as having not spoken fully in the Holy Writings and through the Ecumenical Councils,”
This anathema was first professed by our Lord, God, and Savior Jesus Christ when He said, “And whosoever speaketh a word against the Son of man, it shall be forgiven him: but whosoever speaketh against the Holy Spirit, it shall not be forgiven him, neither in this world, neither in the world to come,” (Matthew 12:32) and then by the great Apostle of the Nations Paul when he proclaims, “but there be some that trouble you, and would pervert the gospel of Christ. ⁸ But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be anathema,” (Galatians 1:7-8).
“All of the modernists through heresy and schism have willingly, according to the Psalmist, dressed themselves with “curse as clothes,” (Psalms 108:18), Whether they may be even Popes or even Patriarchs, or even clergy, or even laity or even an angel from heaven, let them be anathema if they preach to you something other than that which you have received, (Galatians 1).
Patriarchal Encyclical of 1848