You have always been smart. You have always looked for the worst in people, and have been quick to notice when people are up to no good... But in the case of your children, you are blind.
Siempre has sido lista. Has visto lo malo de las gentes a cien leguas... Pero los hijos son los hijos. Ahora estás ciega.
Original text (Spanish)
Notes from Wikiquote
Act II (ll. 833–835)