You will remember how the Apostle Paul puts this in his great passage in the fourth chapter of the Epistle to the Ephesians: ‘That ye be no more children, tossed to and fro, and carried about with every wind of doctrine.’ You see what he means. There were people in the early church who were babes in Christ. They had received the Gospel and believed it, and had become members of the Christian church. But there were false teachers, people going about teaching heresies, and these babes in Christ thought they were rather wonderful and interesting. Then somebody came and said the exact opposite and they went after him. The babe is always the first victim of the latest cult – any sort of refinement, any doctrine, any new theory, and immediately they jump to it and accept it. ‘That ye be no more children, tossed to and fro, and carried about [like a cork on the surface of the wave] by every wind of doctrine’ that chances to come along. That is always a sign of a babe in Christ – the kind of person who rushes into any new religious movement and thought.
– Martyn Lloyd-Jones, Expository Sermons on 2 Peter, p. 249.