The painting in the gallery window clearly had a mistake made in it early on that the artist had tried very hard to cover up. With all her effort, though, it was still evident. Had the mistake been corrected at the start, it would have looked flawless & been less work in the long run.
So it is with training up our kiddos. Let's learn how to lay the groundwork first with God's help, correcting mistakes from the start instead of covering them up until they become even more obvious!