This is a challenging word from Zwingli. He roots this in 2 Timothy 2:23.
“[Those] who bring hatred upon the gospel are those who are more inflated with knowledge of the gospel than ignited with love. They exercise themselves more with quarreling than with gentle Christian living. They see in others what is lacking in their own Christian lives, but in themselves they see no fault. In their minds the way they act is the right way; where they tread, there is a violet or a rose. “If they are to see first their inward state, their eyes should be turned inward. But since they are turned outward, they do nothing but judge and condemn those who are before them and quarrel about external thing” (Zwingli’s Treatise on Rebels and Rebellion, Zurich, 1524).