Dolph's teachings focusses on the oneness of who we really are, what we often hear in spiritual terms. The feeling of separateness starts with the idea that we are a separate entity.
Lets take this screen as a metaphor. While you are reading these words, you actually look at the screen and the words. But the words are not separate from the screen. The words consist of the screen.
Let's take a look at your life. There is a you and a life. That is our general concept. But once investigated, the outcome may be different. You'll discover it is not separate. You Are life looking at itself. Because you can observe yourself its not suddenly becoming separate. In advaita (or non duality in English) we investigate that separateness and we get open and receptive to what we really are.