Paul warns Timothy not to take sin for granted. Paul encourages Timothy to stay in the word. To keep reading the word of God. That’s how his faith will grow. Through the word of God we get our faith and our salvation. Paul uses the example of Jannes and Jambres, two Egyptian magicians, who tried to oppose the power of God. Likewise, if we try to rely on our own skill and power, we are just as silly as these two magicians.