The Kingdom of God is Within You by Leo Tolstoy Chapter 3 Page 49

that the Christians did not judge one another by verbal expressions, but by deed and by heart, since they had perfect liberty to express their ideas without the dread of being called heretics; was it not the easiest and most ordinary ecclesiastical proceeding, if the clergy wanted to get rid of or to ruin anyone, for them to cast suspicion on the person's belief, and to throw a cloak of heresy upon him, and by this means to procure his condemnation and removal?

“True though it may be that there were sins and errors among the so-called heretics, it is no less true and evident,” he says farther on, “from the innumerable examples quoted here (i. e., in the history of the Church and of heresy), that there was not a single sincere and conscientious man of any importance whom the Churchmen would not