But they (the Jews - original branches) were cut away because they did not have faith, and you are "where you are" because... YOU DO HAVE FAITH. So..... don't be proud, but.... be afraid. (of what could happen)
If God cut away those original, natural branches, couldn't He do the same to you? ( the grafted branch is not favored more than the original branch)
NOW YOU SEE....(don't you?) both how kind and how hard God can be. He was hard on those who fell, but He was kind to you. And He will keep on being kind to you.... IF YOU...
KEEP ON trusting in His kindness. OTHERWISE, you TOO will be cut away. (you still don't see?) (Romans 11:20-22)