Mark 2:23

(non occ. sed v. Chrys. Hom. 39, in Matt) But being hungry, they ate simple food, not for pleasure, but on account of the necessity of nature. The Pharisees however, serving the figure and the shadow, accused the disciples of doing wrong. Wherefore there follows, But the Pharisees said unto him, Behold, why do they on the sabbath day that which is not lawful.

(de Op. Monach. 23) For it was a precept in Israel, delivered by a written law, that no one should detain a thief found in his fields, unless he tried to take something away with him. For the man, who had touched nothing else but what he had eaten, they were commanded to allow to go away free and unpunished. Wherefore the Jews accused our Lord's disciples, who were plucking the ears of corn, of breaking the sabbath, rather than of theft.

(Vict. Ant. e Cat. in Marc.) The disciples of Christ, freed from the figure, and united to the truth, do not keep the figurative feast of the sabbath, wherefore it is said, And it came to pass, that he went through the corn fields on the sabbath day; and his disciples began, as they went, to pluck the ears of corn.

(in Marc. 1, 13) We read also in the following part, that they who came and went away were many, and that they had not time enough to take their food, wherefore, according to man's nature, they were hungry.

(ubi sup.) But in a mystical sense the disciples pass through the corn fields, when the holy doctors look with the care of a pious solicitude upon those whom they have initiated in the faith, and who, it is implied, are hungering for the best of all things, the salvation of men. But to pluck the ears of corn means to snatch men away from the eager desire of earthly things. And to rub with the hands is by examples of virtue to put from the purity of their minds the concupiscence of the flesh, as men do husks. To eat the grains is when a man, cleansed from the filth of vice by the mouths of preachers, is incorporated amongst the members of the Church. Again, fitly are the disciples related to have done this, walking before the face of the Lord, for it is necessary that the discourse of the doctor should come first, although the grace of visitation from on high, following it, must enlighten the heart of the hearer. And well, on the sabbath-day, for the doctors themselves in preaching labour for the hope of future rest, and teach their hearers to toil over their tasks for the sake of eternal repose.