Five of them were wise ( φρο ìνιμοι, Matthew 24:45), and five were foolish. The best uncials ( א, B, C, D, L) invert the clauses, in agreement with the order in Matthew 25:3, Matthew 25:4. So the Vulgate.
In this case the idea would be that the foolish were a more prominent and noticeable class than the others. All the virgins were outwardly the same, were provided with the same lamps, prepared to perform the same office; the difference in their characters is proved by the result.
Their folly is seen in the fact that at the time of action they were unable to do the part which a little care and forethought would have enabled them to perform successfully.