What is Non-Duality?
Non-duality is the philosophical idea that the self we experience to be is an illusion – the ego illusion. It implies that any kind of suffering – psychological issues ranging from anxiety to lack of purpose – is the result of experiencing our life events from a point of of being separate, autonomous individuals.
From a non-dualist perspective, trying to resolve these issues without changing our lens never works in the long run as long as there is an ego illusion. Therefore, the first step is to update the lens. This in itself weakens or resolves many of the issues and allows for anything that remains to be examined from a new, more effective angle.
If you’re looking into non-duality, you are likely struggling with resolving something that impedes your quality of life. Either nothing else works or nothing else resonates before someone looks into something as abstract as non-duality, because non-duality won’t make sense until you fully grasp its core concepts.
No Self
Non-dual philosophy entails that there isn’t a self – not really, at least (in Buddhism, this is called Anatta). Yet, how can you and I both experience selfhood while we are respectively reading or writing this? This shouldn’t make sense and will be enough for some to disregard non-duality entirely. But what if it would be possible to experience without the sensation of selfhood? And what to think of the structure from which it follows that the sensation of selfhood is an illusion, which happens to be the central idea of about any Eastern wisdom tradition?
The interpretation of the nature of consciousness in non-dual philosophy is that it's a feedback loop, like the sound you get when you hold a microphone in front of a speaker or when a camera records a monitor that is broadcasting itself.

The Dreamstate
The non-dualist idea about the nature of reality is that the entire universe, with all its fascinating laws and patterns, is essentially dreamlike. It exists just as much as the people and places in your dreams at night exist. It perceives itself from the inside through the many conscious beings, like how your left and right hand sense different things but belong to the same body. The whole point of life is merely: experience. Each conscious being, whether they know it or not, is on a quest to figure out this true nature of reality, to update the lens through which they perceive this game from the inside and simply surrender to its natural urges and let life unfold.
Not Two ≠ All is One
The word “non-duality” comes from the Sanskit “advaita”, which literally means “not two”. A lazy interpretation that is often made, is that non-duality means “all is one”, but that is not entirely correct. After all, why go through the trouble of calling something not two if you can just call it one? That’s because non-duality also means “all is none”. Which definition applies, depends on the perspective you choose to take – that of the person or that of your supposed impersonal, universal essence.
Although it seems trivial to be concerned with such philosophical matters, a whole range of Eastern Wisdom traditions – Zen, Taoism, Dzogchen and various Buddhist and Hindu sects – consider the ability to shift between these two perspectives the greatest of all liberations. They are basically different protocols to obtain that ability.
Bi-Focal Perspective
With a window, you can look either through it, look at the reflection or do both at the same time. There is undeniably your personal perception going on, which is different from my perception and that of the other billions of people. That won’t be different when looking from a non-dual lens, but what would change is the idea of absolute selfhood. With a non-dual lens, sometimes referred to as a “bi-focal perspective” it would rather feel as if the same universe is perceiving itself through your eyes and ears as much as through any other eye or ear, the brain included. And when you perceive yourself, the sensation would be as if one set of eyes and ears of the universe would perceive a tiny aspect of itself. It's like when you look through the window and at the same time look at the reflection in the window.
Non-Doing ≠ Doing Nothing
Now, suppose this is true, how could you prove it? You can’t. There are interesting arguments that can help you form an opinion about the probability, which you’ll find summarized in the following chapters of this book. But if you need proof, the best you could achieve is that you disprove any claim that anything really exists at all or that there is any plan, set of rules, or meaning at the most fundamental level of existence, until nothing of the sort remains. But why would you? Well, it might be your inclination, but otherwise, there is no reason.
All that matters with regard to the quality of life, from a non-dual point of view, is that you figure out a way to let go of the habitual thought process of creating an individual self, often referred to as “waking up from ego identification”. All your other thought processes would carry on, although many change at least slightly, fade out or no longer captivate your conscious attention.
You may still act like an individual with selfhood and have preferences and emotions like one, just like how an actor might surrender to playing a character in a stage play. But having a knowing, deep down, that it’s essentially a witnessing of a dream unfolding removes a lot of questions, stress, desires, and suffering. There is then a simultaneous sensation of oneness with billions of unique individuals and the nothingness of the dream without a dreamer. Your mode of perception has become non-conceptual.
Non-conceptual awareness
Non-duality is often explained with terminology from spirituality, but it doesn't have to. The a-spiritual way to explain it, is that the ego is a conceptualization of a process. Like how we make an object out of a flame because it's a very constant process (a stream of hot gas). Similarly, non-duality posits that we are a constant process. Maybe that's why it was long ago called a being – a verb and not a noun? Our minds can either process holistically (all the information at once) or conceptually (separate reality into smaller chunks and process these one by one and stick them together). In our modern world, we are mostly stimulated and trained to think conceptually. Non-dual awareness can also be called non-conceptual awareness. The more and longer you aren't conceptualizing, the more the brain gets used to different patterns. At some point, it won't even takes an effort to be awake from the ego illusion.
The Relevance of non-duality
Suppose for a moment that the idea of non-duality is correct. What would you supposedly benefit from perceiving life through a non-dual lens?
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You would derive your feeling of happiness not from the outcome of events, but from the awareness of being authentic, which feels similar to what we all know as flow
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In the long run there would be less and less drama in your life, as a surrender to your intuitive drives is considered to be a-karmic
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Over time, neuroses and trauma-based hypersensitivity will fade as emotional backlogs are processed when they surface and past experiences are reframed through the new lens into memories without the meaning they had before
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You naturally become more effective in conscious manifesting
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Habitual compensatory behavior is let go of
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Clarity about purpose, which is nothing more than a destination in order to have an interesting journey
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Calmness from spending less time in the conceptual mode of thinking and freedom to shift between the conceptual and non-conceptual modes
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In the end: no longer a fear of death – a trusting of the universe and the instinctive drives to take care of the timing of death
Here's how a non-dual mental model can look:

In this model, you see that the main change originates at your beliefs – your belief about the nature of your consciousness (the "I" or "self") in particular. When this changes:
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The lens through which you perceive is considered to change (2a)
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You become more accustomed to a non-conceptual mode which gives more clarity about intuitive choices (2b)
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Your belief about following your intuition over ratio or emotion becomes stronger (2c)
This, then, leads to behavioral changes (assuming that you're able to execute your intended behavior) which translates into more satisfaction from seeing yourself being authentic from acting in accordance with your intuition. This reduces your physiology, which feeds back into even more realistic perception, etc., etc.
This model is a generalization, but roughly is the core idea for authors such as Eckhart Tolle, Alan Watts, Sam Harris, and many others. They mainly vary in what they consider the most effective way to change the egoic idea of the self.
Self-development and non-duality
When it comes to self-development or any kind of life improvement strategy, non-duality should be something you either prioritize or disregard, based on your assessment of the validity of the arguments. The reason is that, from a non-dual perspective, any successful effort to improve yourself would be ego reinforcing, which would be creating more issues down the line than it initially resolves. Only after one has obtained non-dual insight and is able to act from it, would regular self-development practices make sense (with the excepting perhaps of practices that create the required mental focus or emotional stability one needs to work on obtaining non-dual insight).
Arguments for Non-Duality
The benefits may look promising, but these are only real if non-duality is real. So, is it? There are no hard arguments for any of the major philosophical ideas about the nature of consciousness. There's no proof of a good, there's no proof of an eternal soul and neither is it proven that scientific models of reality are right. The same goes for non-duality, but there are a view interesting arguments and we've summarized them.