St. Theodore the Studite ca. 759-826
The Commadment of the Lord is not to remain silent in times when the faith is in danger. ‘Speak, he said, and do not remain silent.’” And, “if any man draw back, my soul shall have no pleasure in him” (Heb. 10:38). And, “if these should hold their peace, the stones would immediately cry out” (Lk. 19:40). Thus, when it is a matter of faith, one should not say: ‘Who am I, a priest or a leader of the people?’ In no case should one remain silent. (Letter 71, to Pantoleonti Logotheti, PG 99, 1321)