The doctrines of the apostles were all from God. If you are truly a believer,you must believe that their words were inspired by God. Remember, they were transformed men. If you read paul's epistles well you will see where he was telling his audience that his teachings were received directly from God,except where he asked few things from Peter. Remember the words of paul" imitate me for,I am an ambassador of christ" Let me conclude with this question, do we then say that paul had blasphemed by telling us to imitate him instead of Christ?