This is quite straight forward, and yet has a big impact to the extent it sinks in:
The only thing I know is that perception (awareness, consciousness) is. That’s all. Any content of experience is up for question.
For instance. I know there is experience here. That’s indisputable.
As for the content of this experience, I see a laptop, a room, a fire place, windows, I hear sounds outside, there is a cat here etc. Thoughts interpret my current content of experience in this way, and also adds a human being perceiving all of this, a me sitting here, and so on. And all of that is made up by images and words. It’s all up for questioning. It is, for instance, possible I exist in some sort of Matrix type reality. All of this content of experience may be created for me. It’s perhaps unlikely, but if I am honest I have to admit it’s possible. (And in a loser sense, it’s accurate. My world, as I perceive it, is created for me by this mind, by life.)
Also, I know quite well that as I question my thoughts and assumptions, including the most basic ones of a me and I, what’s revealed is often quite different from how it initially appeared.
So in this sense, Descartes had a point. If we take cogito to mean perception, he was close. I perceive, therefore perception is.
That’s all that’s known. Anything else is up for questioning. (When I wrote “I perceive, therefor I am” in the title, it’s intentionally sloppy – and more aligned with Descarte’s statement. It’s assumed that the “I” in that statement is questioned too, and that even “perception” is questioned. What is the “I” that’s perceiving? Can I find it? What’s left when I see that my images and words of an “I” are not “it”? And if I look, can I really find perception? Can I remove it and show it to someone? Can I take a picture of it and publish it in a magazine?)
Just to mention it: Questioning doesn’t mean not using conventional views as guides for my everyday life. I will still do that. The only difference is that I am open to question even my most basic assumptions, and from that holding them much more lightly. From taking my assumption as true, solid and real, and identifying with them and feeling I need to protect and defend these identities, I recognize them as assumptions and hold them more lightly. And that gives a sense of ease in my life.