In Miguel de Cervantes' The Ingenious Hidalgo Don Quixote of La Mancha, Don Quixote dreams of being a brave knight who rides a great steed to fight for what is right. That dream turned into a vision where he and his squire, Sancho Panza, were fighting dragons and saving fair damsels in distress. The vision spurred him into action. Although his dragon may have been a windmill, with its sails whirling, he mistakes it for a four-armed giant and his fair-haired damsel turns out to be a roadside inn's serving wench and part-time prostitute, Aldonza.

But he took action based upon his dream that produced results; he became more than he was and added value to the people he came in contact with. Or, as it's put in the lyrics from the musical “Man of La Mancha”:

And the world will be better for this
That one man, scorned and covered with scars
Still strove with his last ounce of courage
To reach the unreachable star

 …