I agree with everything he's saying, and especially like the phrase, "Practice doesn't make perfect, practice makes permanent."
In the context of the previous post, he's taking a very left brain approach to the issue, i.e. taking apart any passage that has a mistake, find the error, then play it as slowly as needed to get it right and then slowly bring it up to tempo.
Something I would add to this, though, is to be very careful when choosing the first note of the problem passage. I've often found that a mistake in one measure has its inception in the previous measure. Sometimes we can play a passage well enough, but there's something about our technique that's not solid, which is setting us up for a mistake in what follows.
So you need the left brain to find mistakes and clean them up in a logical and analytical fashion, but the right brain can be helpful as well, helping you see the whole, and better understanding where the mistake is coming from. For example, sometimes what initially appears to be a fingering issue might really be a rhythm issue.