The problem with these men (false teachers) was that they had an amazing power to deceive. They used the right kind of language! They might have spoken very religiously and even Christianly. Because of their trickery or magic arts they had the power to impress people. They were men who were impressive but were diametrically opposed to Moses and the will of God. Yet, because of their character, their tricks, they tended to gather in a great following of people and it seemed that some in the Ephesian Church were vulnerable to their false teaching.