Too much polishing and you spoil things. There's a limit to the expressibility of ideas. You have a new thought, an interesting one. Then, as you try to perfect it, it ceases to be new and interesting, and loses the freshness with which it first occurred to you. You're spoiling it.
If a thing happens once, it can happen again. If any human being has ever realised perfection, we too can do so. If we cannot become perfect here and now, we never can in any state or heaven or condition we may imagine.
When we recorded [Moana], I would do all of the stuff and then save all the big screaming for last so that you can really blow it out and ratchet it up every time, get that perfect panicked pitch.
The pursuit of perfection is frustrating and a waste of time, because nothing is ever perfect.
The pursuit of excellence is commendable and worthwhile. Therefore strive for excellence not perfection.