Gregory of Nyssa

(de Beat. orat. 4.) But in a deeper sense, as they who partake of bodily food vary their appetites according to the nature of the things to be eaten; so also in the food of the soul, by some indeed that is desired which depends upon the opinion of men, by others, that which is essentially and of its own nature good. Hence, according to Matthew, men are blessed who account righteousness in the place of food and drink; by righteousness I mean not a particular but an universal virtue, which he who hungers after is said to be blessed.