The tortuous locutions that finally drove Don Quixote insane:

The tortuous locutions that finally drove Don Quixote insane was when he speculated on his own reasoning:

 ‘The reason of the unreason which has afflicted my reason, debilitating my ability to reason, so that it is with good reason...’

One has an inkling that there is some sense or reason somwhere in this verbal labryinth, it is just hard to put one's finger on it.

Don Quixote, his horse Rocinante and his squire Sancho Panza after an unsuccessful attack on a windmill. By Gustave Doré

Don Quixote charged at the Windmill of 'progress' like a valiant Knight because this new invention had destroyed his previous model  of  agronomic (farming) livelihood. Like a Luddite on horse back he charged  at this man-eating giant (the Windmill) with its monstrously big arms. After all, he was doing it for Spain. However for this kind of attack on progrees, all one gets is a dislocated shoulder.