When watching people talking about immortality, I look at them closely, try to get a sense of their... original essence - if you know what I mean by this. Each person has a unique, original "vibrational-chord" or frequency, or whatever you want to call it. It's infinite in the sense that it is never exhausted (just like taoists described tao). It just is, it is not dependent on space or time (it is beyond time-space). I call it "the inner core", but this is just a label.

Most of people are aware only of their thoughts and lower emotions. Some are aware also of their higher thoughts and higher and inspiring feelings. But the idea is to get even beyond that, to make the connection to this inner core.

When looking at the people I mentioned, I compare them to how they looked when they were really young (were at age of typically 20-30 years old), and how do they look now. I try to identify if the energy that they have changed in time. Whether they have the same fresh "vitality", how their skin look like, even more importantly how much youngness and fresh outlook is there in their eyes etc. Believe it or not, the same applies to absense or presence of any illness - and illness is just an effect of the energy lacking. Energy lacking causes both illness and body cells degredation. Rejuvenation is the opposite: integration. Aging means degrading, rejuvenating means integrating, if to put it in simple words. Behind those two extremes, is the energy that is flowing - or not. Energy obeys universal laws - resonance. To be in perfect resonance means to be connected to the inner core. So this is the essence of everything. Immortality achievement - on physical, ethereal, astral, or whatever level - is always the same then.

I try to have a feeling of their original essence. The typical feeling is that they loose that original essence (despite what they claim, even if they are renown masters in the fields they claim they are related to esoteric subjects).

Immortality, health, rejuvenation, or in other words original essence cannot be hidden behind concepts, terms, philosophy, theology, or even scientific methods (mechanics: DNA engineering, quantum mechanics, or whatever else). There is a connection and energy incoming from that infinite source - or there is not. I believe it is just that simple. Pay attention to your energy and typical feelings - when they slide down on any level, it's a sign of enthropy.