Imperfect humans are inclined to compare themselves with others. Then, they tend to draw conclusions about the value or importance based on their value system. Imperfection makes us prone to compare ourselves with others and to draw conclusions about others that tend to be unfair and unjust. Are there times or circumstances when we are to judge others? Or, do we always avoid judging others?
Even demons believe in the existence of one God. They shudder with fear at the thought of God (see Matt. 8:29). The behavior of demons demonstrated that someone can believe the right thing and still have an evil character. Verse 19 concerns intellectual faith, a faith that touches only the mind. Saving faith involves the will as well as the intellect (see Rom. 4:16–22). – Thomas D. Lea.