Ambrose of Milan : Those emotions therefore which are morally good are the first fruits of our senses, whereas the others are of common and indifferent stock. This classification was used by Moses, following in that respect the language of the Jews, in his reference to the threshing floor of the law: "The tithes of your threshing floor and of your wine vat you shall not delay to pay: you shall give the firstborn of your sons to me." All the morally good emotions of your senses are the first fruits of the threshing floor of the soul in such a manner as grain is separated in an actual barn floor. — CAIN AND ABEL 2.1.5 John Cassian : The law says, "You shall not delay in offering your tithes and first fruits." But grace says, "If you wish to be perfect, go, sell all that you have and give to the poor." — CONFERENCE 21.32.3