Spanish idioms: estar como una cabra

QUOTES FROM DON QUIXOTE Chap. 18 / CITAS DE DON QUIJOTE Cap 18

(The Cervantes Year 1616 - 2016)

Are there teachings in Don Quijote de la Mancha? Is it a didactic novel? The Middle Ages were big on that and Cervantes, a Renaissance man, follows this tradition, or doesn't he?