What is not changing in the world of objects that is perceived? Every-thing is constantly changing. Even the objects which appear to be stationary and visually unchanged are actually changing. Or else, your house would never need maintenance! The water in the river is not the same water that you saw just one second ago. The body that you think you are is changing all the time. You don't have to prove that to yourself. Just look at your old photographs! The mind, that you think you are, is also constantly changing. What gave you pleasure a few months or years ago, no longer satisfies you. Your thoughts about who and what constitutes you, is also constantly changing. One moment, you say 'I am a happy person'. The next moment, you say 'I am not feeling that good or happy'. In the morning, you wake up as one entity and by the end of the day, you realize you have played so many roles (yes, roles such as father or mother, wife or husband, dad or mom, manager, worker, doctor, engineer, including role as a sage etc.) that you cannot pinpoint which one of the entities is really, really, the "you". Because you fail to realize your true unchanging nature, this "you" that you think you are, is constantly in search of a bigger, better, source of joy, peace, happiness and looking in the wrong place (the world of objects) for that. If at all, you think you can find some peace or joy in the world of changing objects, would that be permanent and unchanging. Is that not been your experience so far? Whatever you get you will lose at some time. Is it not clear that the sense of existence, the sense of being, the sense of awareness, the certainty that you ARE, has never changed despite every other thing changing? Is that not your REAL nature? REALITY means unchanging.
All perceptions are constantly of change. However, the only fact that is certain is of perceiving. Perceiving is going on. It is happening irrespective of the nature of the thoughts. Seeing is happening. Hearing is happening. Feeling is happening. It is only after the fact that seeing is happening, that a thought arises, "I see" and in doing so, one has immediately created a Seer ( the false subject) and the Seen ( the false object). You as an entity did nothing to see, as seeing will happen even if the thoughts are elsewhere. An example would be when one day dreams. When day dreaming, while seeing is happening, you do not associate with the objects seen and therefore the mind does not give rise to the thought "I see". Instead, the mind is associated with thoughts of distant objects based on memory or anticipated future- and this is what one calls day dreaming. This shows that seeing is happening independent of your thoughts.
In the same way, being is happening. What do "you" have to do to be? Can you ever not be at this moment? Just relax into this being that you are. Do not put a label on this Being. A label like human Being, supreme Being, or being good or being bad or being this or that. Being is Being-period. Instead of calling yourself a human being, how about being being?