As the writer pointed out, the word "oil" is symbolic of the Holy Spirit, just as the word "horn", as used in Scripture, symbolizes units of power.
During the Tribulation, those who come to Christ will not have eternal security as the Church does now. They will have to continually "earn" their salvation, so to speak. The fact that, as indicated in the passage in the article, the foolish virgins did not keep oil in their lamps tells us that there will be some who are saved during the Tribulation who lose their salvation because they were not vigilant in obedience and keeping the commands of God.
Once we understand the symbols God uses in Scripture, and the timing and context in which they are used, the Bible becomes much clearer and what the Holy Spirit is trying to tell us becomes understandable.
The “writer” says the “oil” in Matthew was symbolic of the spirit...yet Matthew itself does not. The foolish virgins bought their oil(and the Holy spirit can’t be bought)but they weren’t let back into the celebration. The foolish virgins left their place of waiting, being pre-occupied with their appearance before the groom , not with the joy and happiness of the bride groom themselves.
We are all going to be ‘unprepared’ in some way when the “groom comes”, but will he find us waiting and watching? Or as our Lord asked in frustration...”Yet when the son of man comes, will he find faith upon the Earth?”
Pretrib, post trib, no man will be able to “earn” his salvation...it will be his faith that saves him. I don’t even buy the notion that the Holy spirit won’t be around to help those who believe in him no matter what “phase” of God’s timing is in occurence. The Holy Spirit won’t be operating in the same way to convict the world of sin during the trib times but that doesn’t mean he’ll abandon trib saints so that they are going it “totally all alone”. Now a Trib saint may face tremendous persecution and even death but so did much of the early church...but they had the Holy Spirit to help them and so will the Trib saints. For the first 3.5 years, the two witnesses will be a block to the Beast’s total plan; part of their ministry will be in support of the trib saints who are being persecuted. We have the 144 thousand witnesses being sealed as well. God always preserves a remnant and a witness for himself no matter the darknesses of each era!