Are You All Four Certainty?

Around the nineteenth century thinkers started to emerge. who were sceptical of not just this long standing tradition of looking for certainty about things, but more generally. There was a sense at the time that this kind of thinking was sort of outdated, kind of nestalgic, old philosophy. And we start to see thinkers emerge like kirkegarde and nicha,. people that took a look at what it is to be a human being much more in terms of what it's to be an individual. We may only have our thoughts. The universe itself may, in fact, be just one giant thought. I can't sit around all day wondering whether a material world actually exists or not