“but the way of those dealing treacherously is rugged.” (Proverbs 13:15)

The way of the treacherous, on the other hand, is rugged, or “hard.” (New International Version) In what sense? According to one scholar, the word used here means “strong or firm, referring to the callous behavior of wicked people. . . . The man who is set in his evil ways, callous and indifferent to the wise instruction of others, is on a path to ruin.”