have you noticed that when you've become enlightened to some spiritual truth in the word, it's really really difficult to convince someone else about it, even someone who knows the scripture, no matter how you try to explain? if they already have their own ideas about it.
and the ones who do get it, more often than not it's someone who's already seeing Christ revealed all over the Bible and all you've really done is point them to a particular passage - the Spirit Himself opening their eyes, not you?
the 5 wise virgins said they couldn't share their oil; that wouldn't work. the foolish ones were going to have to go get oil for themselves from the source.