[and] you have been saved by it also, if you hold on to it firmly [i.e., continue believing and practicing it]. For if you do not [hold on to it firmly], you will have believed [it] all for nothing.
and not to listen to legends or exhaustive lists of ancestors. These [only] serve to arouse speculations, rather than [promote] God’s plan which is based on faith.
Do not continue to be swept off your course by all kinds of strange teachings. For it is good for your hearts to be strengthened by God’s unearned favor [upon you] and not by [keeping regulations about] foods, which do not benefit those who observe them.
I testify to every person who hears the words of the prophecy of this book [Note: This is probably Jesus speaking, but could possibly be John]. If anyone adds to these words, God will add to him the calamities described in this book.