Personal Experiences
Our personal experiences make up 0.0001% of the world but 99% of how we think the world works.
Our personal experiences are all we can rely on when forming a model of the world. But those experiences are only a tiny sliver of everything that happens in the world — and almost nothing compared to what can happen.
While extrapolating from the miniscule set of personal experience out into the world is inevitable and useful, our world view will always be incomplete or even wrong in many aspects.