You could look at it this way, think if it as peeling an onion. The onion layers are the crap in your head that you need to deal with. So you work hard and peel one layer and it's gone, that layer is not coming back ( but the energy of that layer is not freed for general use), but the removed layer exposes another layer of crap that often looks simiilar ot the previous layer, maybe it even looks worse sometimes. You have made progress but on first glance, it just looks like more of hte same old onion. Plus the changes are gradual so you don't easily notice fo rhtat reason either. It can take a lot of peeling to get to where you can clearly notice progress compared to years previously. The easiest to notice is when you get closest to the core of the center of the onion, which comes towards the end of the process. That's when it becomes more obvious things have changed. IMO, once you peel off a layer of onion, it's not coming back though.
But also consider the skill of peeling, if you don't practice, then your skill in peeling might weaken, an allegory for concentration and other tools of practice. But concentration skills are not 'enlightenment' they are just tools that help you attain it.
Also along hte way there will be many strange mood shifts, altered states, and strange phenomenon. Those come and go for everyone as you progress throught the layers of onion. Like waves on the ocean, when the conditions are just right, you might get some interesting waves and then conditions shift and the waves look more normal again. The interesting waves are not 'enlightenment,' they are part of the path that naturally goes in cycles. When you free up more energy by dealing with some old issue, it feels really good for a short while but then your attention falls back on the next layer of onion which may not be so pleasant. If you try to cling and hold onto some phenomenon too much, it just causes angst and is not going to help you. If you are walking along a path and become enamored of a pretty view, then how are you going to be able to continue walking and see new things? Along the path, you will encounter both very pleasant and unpleasant things, the loss of the pleasant or the encountering of the unpleasant are also a part of hte path, it doesn't mean you have lost anything or are going backward, just more onion layers to work on. ;-P
-Eva
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The best "model" I've seen for this was described by Ken McLeod. Basically, insight is permanent, but the freed energy goes into the remaining unawake reactivity. So the insights don't solve everything and in fact can make things worse. Lingering greed, hatred, and delusion can be abe triggered with even greater intensity. Frankly it explains a lot about teachers which seem to be awake, but f##k-up royally.
Hmm, why even bother then?
Subquestion:
What is the meaning of bolded sentence?