John Calvin Commentary Matthew 25:8

"And the foolish said unto the wise, Give us of your oil; for our lamps are going out." — Matthew 25:8 (ASV)

And the foolish said to the wise. This is a reproof of the late repentance of those who never think of what they lack, until the door is shut against every remedy.

For those who do not make long-term provision are accused of folly, because they are careless, deceive themselves in their poverty, and allow the time for mutual support to pass, despising the help offered to them.

Since they do not think about obtaining oil at the right time, Christ, mocking the knowledge they gain too late, shows how their foolishness will be punished, when they will see themselves empty and unprepared, when no remedy remains.