Rough Roman Memes

In the "I do have 100% certainty", the important part is not the 100% certainty, it is the I. It is a certainty you hold for objective, but since it can only be hold as such by subjective beings like you and me, this subjectivity is transmitted to the 'fact'.

In everyday life it is far easier to consider those facts as absolute, but we have no absolute proof of that (even when you see it, when people tell you they see it, when you read records of the thing, the thing, the people, the records could be an illusion. Though very unlikely, we cannot prove its not without relying on other things that could be illusion)