Sapere aude!

Though, I disagree with a few points, Kant's view of enlightenment is a satisfying one.  In particular, I am sympathetic to his belief that human nature and social structure conspire to repress the free exercise of reason.  Even for the most intelligent and courageous people, it is difficult to be devoted to continual examination of ideas and questions. I won't deal with the many potential objections to this worldview, but I do think that one can consider Kant's argument as one of the reasons we see Kuhn's "scientific revolutions". Human nature is to always think along the path of least resistance, meaning that scientific knowledge proceeds within fixed paradigms until it totally self-destructs.  Kant's argument is obviously not the same as Kuhn's, but the two seem very complementary.