Our one constant

Thus, there is actually objective proof that within our experience of life, which is tremendously varied and full of differences, there is an integrating element that is almost entirely being ignored. And that element is the sameness, or oneness, that is constantly present and makes all experience possible. It is called presence awareness (among many other names), and it is essentially the present moment—right here, right now. It is the “right here, right now” that has always been and will always be. It is the “right here, right now” that you experienced at age five and experience even as you read this page. And this sameness is what makes a sixty- or seventy-year-old feel no different inside than he or she did as  a child. Presence awareness. It was present at birth; it is present at death. Right here, right now. Our one constant.
James Braha
http://www.jamesbraha.com/book_excerpts.html