John Chrysostom
Here again, by indications close at hand, He raises them to the contemplation of the highest things. When He speaks of food, He means nothing other than the salvation of men who were about to come to Him.
The field and the harvest signify the same thing: the multitude of souls ready to receive His preaching. By eyes He means both the eyes of the mind and the bodily eyes.
The disciples already saw the multitude of Samaritans coming to Him. Their readiness and disposition to listen He likens to fields becoming white.
For as ears of grain, when they turn white, are ready for harvest, so they, He says, are now prepared and well disposed for salvation.
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Why did He not say directly that these people were coming to believe in Him and were already ready to receive His teaching? They had been instructed by the prophets and now were bringing forth fruit.
Why did He call them a field and a harvest? What do such figures mean? He does this not only here, but throughout the Gospel.
The prophets used the same manner, speaking figuratively of many things. What is the reason? The grace of the Spirit did not establish this without purpose. Why, then, and for what reason?
For a twofold purpose. First, to make the word more expressive and to present more clearly what is being said. The mind, occupied with images from familiar things, is more strongly awakened.
When it sees representations as though in a picture, it is more drawn by them. This is the first reason.
Second, it sweetens the speech and makes what is said more firmly established in the memory. Plain statements are not grasped so well, nor do they attract the attention of most hearers so much.
But when they are set forth through objects and represented concretely, they are received more readily. This, as may be seen, is done with great wisdom in the present parable.