SUBJECTIVE EXPERIENCES DIFFER GREATLY, REALITY REMAINS UNCHANGING
All my experience is subjective and so is yours. But this does not mean that all of it is private. It can be shared, though not immediately or directly, but only through communication of one or another kind. The subjectivity of all our sensations, perceptions, feelings, thoughts, and conceptions does not arise always - or only - from our subjective inner world, for there are phenomena beyond our control and even beyond ken, be they objects and events from anywhere in space-time or neurones in the brain which register them. Such entities are independent of any one individual, and are common to all who may perceive them.
The causes of responses in the human brain to stimuli come largely from outside the brain (i.e. from the world and/or the body), secondarily from reflections in memory of external stimuli's effects and thoughts or emotions about them. People's perceptions of the same object or event are not necessarily entirely the same, and their interpretation of what they perceive can differ very greatly. There can likewise be inter-subjective agreement about perceptions, just as there may or may not be agreement of interpretations or opinions.
Whatever originates beyond the conscious brain or mind - as well as what it invokes for a person - will always be more or less transitory, for everything changes given time, and not least also the mind and the personality-identity of everyone. All we perceive, conceive and interpret meaning from is relative to the individual mind. Other minds, situated otherwise each have different backgrounds, memories and conceptions.
In a sense, everyone occupies their own subjective space-time, relatively few live entirely in the present. The pseudo-philosophical belief that everyone is in a private sphere where the 'real world' is simply the creation of their own minds and memories is obviously fallacious (but not obviously to those trapped in such solipsism). It is obvious to those whose perception of reality is not shot through with uncritical acceptance of
speculation, reason detached from sufficient experience and knowledge.
Each of us was began to grow up into what can perhaps best be called a 'historically prejudiced' consciousness. Perceptions, ideas, beliefs, ideologies, certainties, doubts and confusions are all conditioned by one's figurative cradle. How confining or otherwise this proves to be will depend not least upon upbringing and the development of personal qualities, upon the degree and kind of autonomy of being that is allowed or encouraged. The chrysalis of accepted truths, from childhood to maturity and beyond. The transformation from whatever herd instincts or cultural leanings one acquired into a free-thinks, self-observant and knowledgeable spirit requires the inspiration and also the hard knocks of the wider personal experience the better. Not that all personal experience is positive, for one's experiences can be so fruitless, debilitating or ruinous that it quells the spirit.
A time warp of the kind which preserves the outlook of the adolescent and young man in a cocoon that filters and monitors that happens thereafter is not at all uncommon. The classic example, perhaps, is the result of religion. Religionists are invariably partly trapped in a redundant past - through scriptures and doctrine which go back to far lass informed and largely superstitious and confused peoples, long before the advent of empirical natural science and explanation of countless events that were thought to be caused supernaturally. No new religion, free of such prejudice, has arisen since the 20th century's phenomenal rise of the many sciences and their proven applications. All mainstream religions are more or less an amalgam of ancient dogmas and unavoidable modifications caused by the advent of testable knowledge. Some even still preserve the mores of quite primitive and societies, often most barbarous and dangerous to the present world.
Solipsism
In a sense, everyone occupies their own subjective space-time, relatively few live entirely in the present. The pseudo-philosophical belief that everyone is in a private sphere where the 'real world' is simply the creation of their own minds and memories is obviously fallacious (but not obviously to those trapped in such solipsism). It is obvious to those whose perception of reality is not shot through with uncritical acceptance of speculation, reason detached from sufficient experience and knowledge.
Solipsism is a philosophical theory of knowledge, the key position of which is no one else but oneself exists. All one perceives and experiences is the spontaneous creation of one's own mind. This can, of course, never be proved or disproved in any conclusive fashion. The convinced believer in solipsism cannot be argued down by decisive evidence that others exist, since the evidence and the person stating it can all be claimed to be a creation of the mind of the solipsist. The external world likewise… it is a projection of the solipsist's mind.
However, if the solipsist is the only being who exists, why does his mind create the illusion that there is an external world, one which limits his abilities to do many things and constrains him in countless ways? Why is the solipsist's mind itself, being the only one in existence, incapable of creating whatever he wishes simply through thinking it? If the universe is, as some insist, a delusion, why does the solipsist allow his mind to go on creating a delusion?
This solipsist delusion of narcissistic 'untouchability' would have been developed through time and diverse circumstances, a growing cognitive disorder caused by long-term underlying personal problems or reduced mental quality. The claims cannot be sustained for even the most hard-line solipsist has to interact with the real world, so actions will conflict with the rigorous opinion. The chief psychological feature of solipsism is, most likely, an extreme bias towards black-and-white thinking and an exclusively one-sided and artificially limited application of scepticism.
Scepticism
Scepticism is a method, not a belief system. It can, like any method, be badly understood and misapplied, but properly understood it is a means to clearing away bewitchment of the mind through habit, unreflecting blundering, the wiles and traps of language (especially the written word), and the ossification of one's cherished experiences and ideas.
Sceptical thought differs from the subject matter it investigates in that it can reveal what the subject matter occludes or has purposely been covered up. When sceptical inquiry is applied even-handedly by pursuing both pro and contra standpoints, alternative theories etc., it will - if successful - develop more and more pseudo-evidence to support for the one or the other. Once the dialectic of overviews is sorted out sufficiently it can reach conclusions which are far superior to mere rational conjecture. It is the guardian against false beliefs, unfounded beliefs, and beliefs which run contrary to knowledge and evidence. That is why no person retains a religious faith of any kind when they are accomplished thinkers who question rather than believe what they want, what is comfortable, and what they depend on like an emotional crutch. The stage is reality, there is nothing behind it (except speculative wishful thinking) and the audience is part of the entire theatre.