It is reasonable to ask what reason originated from.

 

We are post Enlightenment and reason, as some argue  is a tenet of the Enlightenment.

They would argue that reason or common are power power tools  l

Like when people say you are not being reasonable this is a power tool.

And how did reason originate, surely to come into existance it had to define itself against another reason, whose truth and identity was also assigned by reason, thus giving reason the false appearing of originating from itself.  Which is the causa sui argument  (it orignated from itself)