I've been listening to this series of talks (actually I think for the second time, but I forget things easily...): http://www.audiodharma.org/series/1/talk/1839/
Mindfulness and Concentration
Right Mindfulness and Right Concentration, together with Right Effort, form the concentration-aggregate of the noble eightfold path. Although these factors are often discussed separately, the Pali discourses show that the Buddha meant for them to form a unified practice. This course through talks, readings, discussions, and meditation explored what these factors means and how they can be brought together in a mutually supportive and nourishing way.
You might like to work through the 30 minute guided meditation at the start if you want to see how his approach is implemented.
In talking about concentration he mentions that in the end one has to realise that even the most pleasant, concentrated, state is impermanent and should not be clung to (as mentioned in various suttas). His particular spin is that it is very powerful to realise that something that one is so attached to is impermanent and ultimately unsatisfactory. http://www.accesstoinsight.org/tipitaka ... .than.html
There is the case where a monk, secluded from sensuality, secluded from unskillful qualities, enters & remains in the first jhana: rapture & pleasure born of seclusion, accompanied by directed thought & evaluation. He regards whatever phenomena there that are connected with form, feeling, perception, fabrications, & consciousness, as inconstant, stressful, a disease, a cancer, an arrow, painful, an affliction, alien, a disintegration, an emptiness, not-self. He turns his mind away from those phenomena, and having done so, inclines his mind to the property of deathlessness: 'This is peace, this is exquisite — the resolution of all fabrications; the relinquishment of all acquisitions; the ending of craving; dispassion; cessation; Unbinding.
I can't find exactly what he says in the transcribed talks on Access to Insight, but here's some more from Ven Thanissaro, commenting about attachment, or not, to pleasant experiences: http://www.accesstoinsight.org/lib/auth ... tml#gotcha
http://www.accesstoinsight.org/lib/auth ... eightening
In this way, the pursuit of happiness through developing strong concentration for the pursuit of total freedom is not a selfish thing. As long as your concentration is imbued with the other factors of the path — right view, right resolve, right speech, right action, right livelihood, right effort, right mindfulness — it's perfectly safe. They sometimes talk about getting stuck on concentration or becoming a concentration junkie, but those are cases where the concentration lacks the other elements of the path. Your understanding of why there's suffering in the world is skewed, or your understanding of why you're suffering is skewed. You spend all your time just focusing on your breath and not wanting to do anything for anyone else anywhere, not wanting to be bothered by the world.
This is especially important when really strong experiences come in the meditation. You don't jump to any conclusions. Again, you lift the mind above them and watch. Hopefully by that time the habit has become built-in enough so that you realize you can't allow yourself to get attached to anything, even the really amazing experiences. Lift yourself up rung by rung by rung along the ladder. You go from one attachment to a higher one to a higher one. Finally, though, there comes a point where you have to let go and just watch what happens. Only when you've developed this habit of lifting the mind up can you get through some of these experiences that waylay everyone else along the meditation path.
And here's Sayadaw U Pandita spin on the pleasant experiences: http://homepage.ntlworld.com/pesala/Pan ... hanas.html
If you have extraordinary experiences, please make it a point to note and label them. Be clearly aware that rapture, faith, tranquility and so forth are no more than mental states. If, while noting them, you realize that you are attached to them, cut the attachment immediately and return your attention to the primary object at the abdomen. Only then will your progress continue, and it will bring you even sweeter fruit.
Meditation teachers have to be tactful in dealing with students who are in this stage of practice. The students are so excited by their experiences that they tend to rebel if the teacher is too deflating. Instead, one might gently say, “Your practice is not bad. These are natural things which arise in practice, but there are many other experiences which are much better than what you have now. So why don’t you note all these things so you can experience the better ones?”
Paying heed to these instructions, the yogi returns to sitting and carefully notes the lights, faith, rapture, happiness, tranquility and comfort. It dawns on him or her that this simple noting actually is the correct path of practice. Thus oriented, he or she can proceed with great confidence.