“It is a science,” said Don Quixote, “that comprehends in itself all or most of the sciences in the world, for he who professes it must be a jurist, and must know the rules of justice, distributive and equitable, so as to give to each one what belongs to him and is due to him. He must be a theologian, so as to be able to give a clear and distinctive reason for the Christian faith he professes, wherever it may be asked of him. He must be a physician, and above all a herbalist, so as in wastes and solitudes to know the herbs that have the property of healing wounds, for a knight-errant must not go looking for someone to cure him at every step. He must be an astronomer, so as to know by the stars how many hours of the night have passed, and what clime and quarter of the world he is in. He must know mathematics, for at every turn some occasion for them will present itself to him; and, putting it aside that he must be adorned with all the virtues, cardinal and theological, to come down to minor particulars, he must, I say, be able to swim as well as Nicholas or Nicolao the Fish could, as the story goes; 603