The Buddha taught that tranquility and insight are two qualities of mind that should both be cultivated.
Tranquility yields immediate benefits - you should feel tranquil after your first meditation session. Insight yields benefits that accumulate over time. As you observe the mind, you gradually learn how to let go of attachments and aversions.
In my view, tranquility involves two factors: relaxation and quieting the mental chatter. Relaxation occurs when the parasympathetic nervous system is active the sympathetic nervous system in inactive. Mental chatter is reduced when the default network in the brain is inactive and the experiential network in the brain is active.
The parasympathetic nervous system can be activated and the sympathetic nervous system can be deactivated with relaxing meditation.
The default network in the brain can be deactivated and the experiential network can be activated through relaxed concentration in meditation and through mindfulness in daily life. When the mind is focused on something occuring in present moment, the experiential network becomes active and the default network becomes inactive. The focus can be on an object of meditation as in the relaxing meditation in the previous paragraph, or it can be some type of mindfulness practice.
Tranquility is beneficial in itself (most people would prefer to feel tranquil and serene rather than stressed and upset)
And tranquility also assists in developing insight. When the mind is tranquil you do not get distracted and carried away by thoughts, emotions, impulses, sensory experiences, or the ego so you can observe the activity mind much better when the mind is tranquil. Observing the activity of the mind is how insight is acquired.
Insight can be explained in various ways and different people take different approaches to it. My approach to insight is to understand suffering so that one can reduce it as much as possible. The way to do this, in my opinion is to observe the activity of the mind.
In my opinion the essence of Buddhism is that it tells how to bring about an end to suffering. It seems to me the simplest way to do that is to cultivate tranquility and then observe the activity of the mind, see how suffering arises and fades and then use that knowledge to reduce the amount of suffering you experience.
In a very simple way of saying it, insight comes from observing suffering arising and fading which is the same as noticing when tranquility is disturbed and then returning to tranquility.
My approach is similar to that of Ajahn Chah which Jack Kornfield described as:
As Ajahn Chah described them, meditative states are not important in themselves. Meditation is a way to quiet the mind so you can practice all day long wherever you are; see when there is grasping or aversion, clinging or suffering; and then let it go.
My article on Observing the Mind describes how I recommend cultivating insight.
I've written about how fully letting go of emotions requires paying attention to even faint emotions that are barely on the edge of consciousness and bring them into awareness, and also feeling the full depth of emotions. Over time these two skills become an automatic habit and the result is like having the door to emotions entirely and constantly open so that when an unpleasant emotion arises you are just waving goodbye to it as it passes out the door. It isn't exactly pleasant, but the emotion doesn't hang around and cast a cloud over reality either. This is like the way Shinzen Young describes the Bhanga-nana (dissolution) the stage after A&P where, as he describes it, you see arising and fading as simultaneous. The consequence is that those unpleasant emotions don't linger in the back of your mind causing trouble. That comes from bringing them out and feeling them to their full depth. Without all that trouble, without the dukkha aspect of all things causing you suffering, what remains is ... nice.
I don't claim to have perfected this and I don't know if it leads to the perfect 100% end of suffering, but it is ... nice.
A lot of time spent observing the mind and dukkha in particular (in meditation and daily life) is needed to get to this point. At first suffering seems involuntary, then after a lot of observation you begin to feel more like it is a habit that you are doing automatically, so you begin to try to change your habit. You notice that suppressing doesn't really help, relaxing while feeling emotions to their full depth does help, and bringing them out fully into consciousness even if they are just faint inklings in the back of the mind helps too. Somewhere in there can be a lot of very unpleasant feelings coming out so you don't try to do it all at once, you give yourself a rest when you need to - meditation that produces tranquility can help. And emotions can hide under layers of other emotions so sometimes you have to dig through the layers to find what you need to let go of. But in time you get out a lot of baggage and become somewhat desensitized, and eventually bringing out and letting out becomes a habit and you notice your mood is a lot lighter and it's ... nice.
Ultimately, letting go means being relaxed and while bringing into consciousness and feeling to their full depth (in their entirety) feelings that are unpleasant, so faint they are barely conscious, or buried under layers of other emotions, and not getting carried away by thoughts emotions, impulses, sensory experience, or ego, so that they don't take over your mind and body. Being relaxed with a quiet mind while observing the mind makes this possible.
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