Answered in example sentence
"I do not say, Sancho," replied Don Quixote, "that it is imperative on knights-errant not to eat anything else but the fruits thou speakest of; only that their more usual diet must be those, and certain herbs they found in the fields which they knew and I know too.""A good thing it is," answered Sancho, "to know those herbs, for to my thinking it will be needful some day to put that knowledge into practice."