Kant - Think what you want, but do what you must...
Kant defines two essential conditions under which mankind can escape from its immaturity. And these two conditions are at once spiritual and institutional, ethical and political.
The first of these conditions is that the realm of obedience and the realm of the use of reason be clearly distinguished. Briefly characterizing the immature status, Kant invokes the familiar expression: "Don't think, just follow orders"; such is, according to him, the form in which military discipline, political power, and religious authority are usually exercised. Humanity will reach maturity when it is no longer required to obey, but when men are told: "Obey, and you will be able to reason as much as you like." We must note that the German word for used here is rasonieren; this word, which is also used in the Critiques, does not refer to just any use of reason, but to a use of reason in which reason has no other end but itself: rasonieren is to reason for reasoning sake. And Kant gives examples, these too being perfectly trivial in appearance: paying one's taxes, while being able to argue as much as one likes about the system of taxation, would be characteristic of a mature state; or again, taking responsibility for parish service, if one is a pastor, while reasoning freely about religious dogmas.
Michel Foucault, What is Enlightenment