Goya's series of etchings

These are some links with very complete information about Goya's etchings: 

http://www.museodelprado.es/goya-en-el-prado/

http://www.pomona.edu/museum/collections/goya.aspx

http://goya.unizar.es/InfoGoya/Work/Grabado.html

And here you have one of my favourite etchings, from the Caprices' series. It's Caprice Number 37 and was  published for the first time in 1799. Its title is  Will the disciple be wiser?(¿Si sabrá más el discípulo?). 

Source: http://www.museodelprado.es/goya-en-el-prado/obras/ficha/goya/si-sabra-mas-el-discipulo/?tx_gbgonline_pi1%5Bgocollectionids%5D=26&tx_gbgonline_pi1%5Bgosort%5D=d

On it Goya criticized the education of his time. He was influenced by the ideas of Enlightenment and trusted in education as the best way of changing and modernizing society. The notes that accompanied this etching were the following: "Braying is the only think a donkey teacher can teach" ("Un maestro burro no puede enseñar más que a rebuznar"), "Donkey teachers can only get little donkeys" ("Los maestros burros no pueden sacar más que borriquillos").