How is Kant's "method of critical thinking" reflected in this address, An Introduction to the History of Philosophy?

This academic speech is highly discursive, profound, clear and precise. The speaker preached his own "critical philosophy", the object of criticism is the rational cognitive ability of human beings. He does not want to believe blindly in the power of reason, but wants to examine it, clean it up, and measure it to see how far it is capable of going, and how far it can reach in its activities. This is the "method of critical thinking".