You are from God, little children, and have overcome them; because greater is He who is in you than he who is in the world.
What an encouragement! No matter how charismatic, how convincing, or how skilled an orator any false teacher is, you have overcome them as a true believer. Although you may stutter in your speech or be unable to win a debate, the spirit of God in you has overcome the spirit of antichrist in them. The word of God, your spiritual sword, will be your defense. Although you may not be able to turn them from their false beliefs, they will never turn you from the truth of God firmly planted within your heart. If you are a child of God, his Spirit within you will sound an alarm when you are confronted with false teaching. You may not even be able to put your finger on what the false teaching is, but your uneasy spirit will alert you and keep you from being seduced away from the truth.
When we know the Good Shepherd through prayer and scripture we will recognize his voice. We will never follow a stranger but will instead run away, because we do not recognize the voice of strangers.