Hegel

it is least of all the logos that should be kept outside the science of logic.

On the contrary, all too often and all too vehemently have I been confronted by opponents incapable of the simple consideration that their opinions and objections imply categories which are presuppositions and themselves in need of being criticized first before they are put to use. Lack of self-awareness in this matter is incredibly profound; it is responsible for the misunderstanding which is the cause of all others, the nasty and uneducated practice of taking for a category under consideration something other than this category itself.

There is something stupid – I have no other word for it – about this didactic mannerism