It is true that ‘you’ cannot know the thought that ‘I’ am having. In other words all thoughts are limited. However, as a result of this observation we make the irrational assumption that the Awareness that knows ‘your’ thought and the Awareness that knows ‘my’ thought must also be limited. This is like saying that, because a person in Australia cannot see a person in the UK, therefore the two people must exist in different physical spaces. In other words, we make the presumption that Awareness shares the limitations of what it is aware of.
We cannot prove with the mind that Awareness is not limited but we can, with the mind, explore all the apparent evidence that suggests that it is limited. As a result of this experiential exploration we come to realise that there is no real evidence for the idea that Awareness is located or limited and realise, therefore, that this idea is simply a belief. It is the religion to which the vast majority of humanity subscribe without knowing it. That is as far as the mind can go. In other words, the mind simply cannot know anything about Awareness, even though it is made out of it, just as the character in the movie cannot know anything about the screen.
Now that you have seen that the mind cannot tell you anything about Awareness, explore your own intimate experience of Awareness. You are aware that ‘I am.’ What is it that is aware that I am? It is obviously I, Awareness, that am aware that I am. The ‘I’ that I am is the same ‘I’ that is aware that I am. In other words, in the simple recognition that I am, Awareness is aware of its own being. In other words, the simple knowing of our own being is the experience of Awareness being aware of itself. This is the simple, most obvious, ever-present fact of experience.
Now, referring only to your direct experience of your self, Awareness – its experience of itself – ask your self if you find any limit there. Does Awareness have any knowledge of a limit in itself? Does it know itself as having an age, nationality, weight, gender, size, colour, shape etc? Does it ever experience itself appearing or disappearing, being born or dying, coming, going, moving, evolving or changing? If the answer to any of these questions is ‘yes,’ then you are mistaking yourself for some kind of an object, or rather, thought is mistaking you, Awareness, for some kind of an object such as a thought, feeling or sensation.
Keep going back to your experience of your self - Awareness’ experience of itself (which is not any kind of objective knowledge) - and ascertain for yourself that your own experience of yourself is simply that you are ever-present and without limits or location, that you cannot be disturbed and are therefore peace itself, that there is no lack in you, nor the slightest impulse to avoid the now and you are therefore happiness itself, and that you are utterly intimately one with all appearances and are thus love itself, in which there is no room for ‘otherness,’ distance or separation.
Having discovered this, start to live a life at all levels of experience (thoughts, feelings, perceptions, activities and relationships) that is in line with this discovery. Be open to the possibility that the Awareness with which all people and animals are aware of anything is the very same Awareness with you are aware of these words right now. Treat people and animals as such, that is, as your very own self.