I believe this verse is speaking of the rapture of the church and as such, we need to hold fast to what we have until that time. We are encouraged to diligently and faithfully occupy until the Lord returns for us to take us home to be with Him.
I'm reminded of a story that has been told about twomissionaries who had spent their entire lives on the mission field and they were finally coming home. They just happened to be on the same boat as the Queen of England. Upon arrival the Queen was greeted by thousands, with music, and applauds and the husband said, "You know we’ve spent our entire lives serving the Lord, and come home to nothing. This lady has done nothing, but was born into it." The wife said, "But, we’re not home yet!"
We need to remember that as well.