he who says he remains in him ought himself also to walk just like he walked.

 In 1 John 2:20 John goes on to remind his people that all of them possess knowledge. The people who had gone out were Gnostics who claimed that there had been given to them a secret, special and advanced knowledge which was not open to the ordinary Christian. John reminds his people that in matters of faith the humblest Christian need have no feeling of inferiority to the most learned scholar. There are, of course, matters of technical scholarship, of language, of history, which must be the preserve of the expert; but the essentials of the faith are the possession of every man. 