Advaita means nondual or not two. This oneness is a fundamental quality of everything. Everything is a part of and made of one substance. Often the question arises, If it is all one thing why dont I experience it that way? This is confusing oneness for the appearance of sameness. Things can appear different without being separate. Just look at your hand for a moment. Your fingers are all different from each other, but are they separate? They all arise from the same hand.
Similarly, the objects, animals, plants and people in the world are all definitely different in their appearance and functioning. But in their ultimate nature, they are all connected at their source. So, this one Being has an infinite number of different expressions that we experience as different objects.
It also turns out that your fingers are all made of the same substance. As you explore the nature of your hand with greater subtlety, you discover more and more similarities. Your fingers are actually made up of very similar tissues, cells, atoms, and ultimately subatomic particles. When your experience of reality becomes even more subtle, you discover that everything is just a different...