Advaita means nondual or “not two.” This oneness is a fundamental quality of everything. Everything is a part of and made of one nondual consciousness.
Notice your fingers and the palm of your hand. Can you say where one starts and the other ends, or are they one thing? To take this further, where does your hand stop and your forearm begin? Can you experience the oneness of your hand and your forearm? If these are not separate, then what about other parts of your body? Are your feet and your ears really one even though they are so different? Now notice if there really is a separation between your thoughts and your head. Where does your head stop and something else called thought begin? What about feelings or desires? Are they really separate from you or your body?
Now, notice the simple sensations you are having: the sounds you are hearing, the sensations of touch, and the objects and events you are seeing. If you are seeing something, where does the seeing stop and something else called the eye begin? If you are hearing sounds, where does the sound start and the ear stop? Perhaps the hearing, the sound, and your ear are all one thing. Yes, the ear is different from the sound, but in the act of hearing, they become one thing.
Then, where does the source of the sound stop and the sound itself start? For example, if a bird is singing outside your window, where does the bird stop and the sound of its song begin? Or are they one thing? If the bird and its song are one thing, and your hearing and the song are one thing, then is it possible that you and the bird are also one thing?
The Advaita truth of nondual consciousness, or oneness of Being, has often been thought of as something hidden or difficult to experience, when it is quite ordinary and available in every moment. Nondual consciousness is the natural state. Of course, a dramatic experience of oneness is a rare event. But why wait for something so rare when this sweet and satisfying oneness is right here, right now?
– excerpt from ‘What Is Advaita or Nonduality?’