It's crucial that we keep a firm grip on what we've heard so that we don't drift off.
If the old message delivered by the angels was valid and nobody got away with anything,
do you think we can risk neglecting this latest message, this magnificent salvation? First of all, it was delivered in person by the Master, then accurately passed on to us by those who heard it from him.
All the while God was validating it with gifts through the Holy Spirit, all sorts of signs and miracles, as he saw fit.