Let's assume that our words and sentences are able to describe the truth. It is clear that whatever we know - even if we have knowledge about an entire universe and every position and momentum of its particles - we are inherently determined to not know whether we know really everything. It implies that we cannot prove anything because it would require a complete knowledge which we cannot know we have. That implies that we are never going to be able to know the absolute truth. In other words, we are never going to be able to know the absolute truth because it would require knowing everything. (Even if we knew everything, we are not able to know that we know everything and therefore we are inherently determined just to assume that something is true.)
Yet it seems to me that we are actually able to know one absolute truth, which is the following:
We know for sure that we cannot know whether we know everything and therefore we cannot know anything for sure.
I know that I am contradicting myself but this problem seems to me rather peculiar. Am I touching on some problem of an incompleteness theorem? What do you think about my reasoning? Since it is just my reasoning, would you please give me some reference to it?