Censure of the wicked

Wicked people are likened to venomous snakes: crooked, harmful by their look, double-tongued, seeking faults as snakes seek holes, and troubling others; some, valued only at home, blame all scholars out of envy, and others roam like goblins. The author asks whether envying them could be his duty; a footnote gives a variant reading saying that good people avoid envy.