Therefore, many interpret that quote above to be assurance of the safety of the Church on Earth. Not so (in my understanding). It is more that we will find our safety in preaching as the Enemy's gates can't stand against it. If we fail to preach, we can be overrun.
.And Jesus came and spoke to them, saying, "All authority has been given to Me in heaven and on earth. Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all things that I have commanded you; and lo, I am with you always, even to the end of the age." Amen. (Matthew 28:18-20)