"Forgive me, my friend, for the opportunity I gave you to seem as mad as I, making you fall into the error into which I fell, thinking that there were and are knights errant in the world."

"Oh!" responded Sancho, weeping. "Don't die, Señor; your grace should take my advice and live for many years, because the greatest madness a man can commit in this life is to let himself die, just like that, without anybody killing him or any other hands ending his life except those of melancholy. Look, don't be lazy, but get up from that bed and let's go to the countryside dressed as shepherds, just like we arranged: maybe behind some bush we'll find Señora Doña Dulcinea disenchanted, as pretty as you please. If you're dying of sorrow over being defeated, blame me for that and say you were toppled because I didn't tighten Rocinante's cinches; besides, your grace must have seen in your books of chivalry that it's a very common thing for one knight to topple another, and for the one who's vanquished today to be the victor tomorrow."

(Edith Grossman's translation)

http://en.wikipedia.org/wiki/Don_Quixote