Unit 4: Immanuel Kant

1. Critical Philosophy

Kant’s "Critical Philosophy" was a response to the "dogmatism" of Rationalists (who claimed reason alone could know everything) and the "skepticism" of Hume (who claimed we could know nothing for certain). Kant famously remarked that Hume "awoke him from his dogmatic slumber."

The Synthesis

Kant argued that both traditions were partially right but incomplete. He summarized his view with the famous statement:

"Thoughts without content are empty, intuitions without concepts are blind."

This means that while all knowledge begins with experience (Empiricism), the mind organizes that experience through its own innate structures (Rationalism).

2. The Copernican Revolution

Before Kant, philosophers assumed that the mind must conform to objects. Kant reversed this, suggesting that objects must conform to the mind.

Just as Copernicus realized the sun doesn't revolve around the earth, Kant realized that the mind is not a passive mirror reflecting reality. Instead, the mind is an active processor that imposes its own laws (like Space, Time, and Causality) onto sensory data.

3. Synthetic A Priori Judgments

Kant’s central question in the Critique of Pure Reason was: "How are synthetic a priori judgments possible?" To understand this, we must look at his classification of knowledge:

Kant argued that Math, Physics, and Metaphysics are built on these Synthetic A Priori judgments.

4. Phenomenon and Noumenon

Because the mind filters reality through its own "glasses" (Space and Time), Kant made a distinction between the world as we see it and the world as it is.

• Phenomenon: The world as it appears to us through the senses and categories of the mind. This is what science studies.
• Noumenon (Thing-in-itself): Reality as it exists independently of our perception. Kant argued we can never know the noumenon; we can only know things as they appear to us.