system
Given the following post, respond as if you're commenting on Reddit:
human
What makes Immanuel Kant such a good philosopher? What did he express or mention that made him so prominent and outstanding?

He is my favorite philosopher just because people say he is one of the top 3 best, and I even have a book about him.

I am just a beginner, and a novice, and I don't really understand what makes him so great?
gpt
Why is he your favorite philosopher if you don't know why he's great?

Kant is important in philosophy mainly for what he calls his "Copernican Revolution"--his idea that the mind doesn't merely record the external world, but that it actively shapes it.