I think one of the ways we learn about the world is through perception. Our senses help us understand the things around us. We can also learn about our thoughts and feelings through introspection. Besides, we can acquire knowledge through remembering experiences, intuition, making inferences, and listening to others.
Discussion
I think all knowledge is grounded or anchored to an objective truth(s) established via their verifiability in reality.
Perceptions are useful but dangerous abstractions of objective truths. We can perceive the smell of bacon and infer knowledge of bacon in the next room but it can actually be in truth a dangerous concoction of chemicals in the environment etc.
One can drive oneself mad through introspection precisely because the knowledge acquired may lose any sense of anchoring to an objective truth of the physical world.
Perhaps I'm wrong. Strong posibility 🤣