Despite the delusions of some people, who claim to know what was happening in the universe 13 or 14 billion years ago, we don't even know what is happening now, nor yesterday, let alone thousands, millions and billions of years ago.
We can have theories, calculations, projections, estimations and all sorts of tools of investigation, but many a time the end result is conjecture as the foundations were based on conjecture. Many of our supposed hard facts are in fact built on assumptions which are not definite. But conformity, trust or blind following prevent us from subjecting our assumptions, principles and methods of judgement to critical analysis, rational investigation and intellectual rigour.
One problem is thinking that we know when we don't and another problem is not even knowing that we don't know. How many concepts are considered to be true when under even the most simple questioning exposes them to be wanting?
Slogans are short and snappy and easily transmitted but when held up to detailed criticism or even just held up in the scale of reality, carry no weight.
"We live in a free society" No we don't.... Every aspect of life is dominated by hundreds or thousands of laws, every sphere of our life is restricted.
"Science has proven such and such" No it hasn't it has performed experiments and has a working understanding, always subject to challenge and change... And who do you mean exactly by 'Science'? Who speaks for it? Are you sure it has a voice or that it says anything at all? Science education, organizations, scientists and governmental curricula and corporate funded studies performed by affilliated scientists with a mutual interest, agenda and philosophy is something other than 'reality' or 'science says'.
"There is no proof for such and such" Are you sure? You thought about all the possibilities in a sound and rigorous manner? You asked everyone on earth what they base their position on? Your perception reaches every potential place? You gathered all available knowledge on everything? You understood everything that you were told and have correctly interpreted everything available?
"I know that there is no reality to such and such, nobody has any proof" Really? So you assume that if you don't have knowledge of something then everyone else doesn't also, because their knowledge could only be equal to or less than your own?
"Such and such is nonsense" Are you certain of that? So because your own mind judges a matter to be nonsense, then that must be the case... You are sure because all of your foundations and tools of judgement are rigorously tested, proven and reliable? You have never made a mistake in their utilization? Your principles are never subject to any mistaken application?
Just because we reject something with our minds it doesn't necessarily mean that our minds are correct. Our minds are limited and people vary greatly in their intellect or in their principles and mechanisms of thought. Just because we don't understand something, it doesn't automatically mean no-one else can understand it. We should not assume that everyone else is intellectually equal or inferior to ourselves.
It may well be that we reject and deny many things due to our extreme mental delusions, our emotional states, our lack of coherent thinking and the cultural, ideological and political influences that hinder clear judgement and prevent sound reasoning and thought.
Some things are unknowable due to their nature, somethings are known due to their nature, some things are known by many but not by few and many things are known by few and not by the many.
Not knowing what we think we know can be as costly as not knowing what we need to know, even though we know that we don't know it. But just because we know that we don't know, it doesn't mean we can't know and just because we know and we know that we know, it doesn't mean that there isn't more to know or doesn't mean that we can't know even if we think we know that we can't know.