Who thought that the human brain can understand everything?

The belief that the human brain can understand everything is often attributed to philosophers and scientists throughout history, including figures like René Descartes and later, some proponents of the Enlightenment. However, more contemporary views recognize the limitations of human cognition, acknowledging that while the brain is capable of remarkable understanding, it cannot grasp every aspect of the universe due to constraints in perception, knowledge, and complexity. This perspective is reinforced by advancements in cognitive science and neuroscience, which reveal the brain's inherent limitations.