Luke 8:11

(in Hom. 15 in Ev.) But our Lord condescended to explain what He said, that we might know how to seek for explanation in those things which He is unwilling to explain through Himself. For it follows, Now the parable is this: The seed is the word of God.

(Hom. 44. in Matt.) And to sum up many things in a few words. Some indeed as careless hearers, some as weak, but others as the very slaves of pleasure and worldly things, hold aloof from what is good. The order of the way side, the rock, and the thorns is well, for we have first need of recollection and caution, next of fortitude, and then of contempt of things present. He therefore places the good ground in opposition to the way, the rock, and the thorns. But that on the good ground are they, which in an honest and good heart, having heard the word, keep it, &c. For they who are on the way side keep not the word, but the devil takes away their seed. But they who are on the rock sustain not patiently the assaults of temptation through weakness. But they who are among thorns bear no fruit, but are choked.

The seed is the Word of God. Those on the way are they who have heard. Afterwards, the devil comes and takes away the Word from their heart, that they may not believe and be saved. We see in a moment that the hardness of the ground causes the seed on the pathways to be snatched away. A pathway always is hard and untilled, because it is exposed to every one's feet. It does not admit any seed into it, but it lies rather upon the surface, ready for any birds that will to snatch it away. All whose minds are hard and unyielding, and so to speak, pressed together, do not receive the divine seed. The divine and sacred admonition does not find an entrance into them. They do not accept the words that would produce in them the fear of God and by means of which they could bring forth as fruits the glories of virtue. They have made themselves a beaten and trampled pathway for unclean demons, yes, for Satan himself, such as never can bear holy fruit. Let those who are awake, whose heart is sterile and unfruitful, open your mind, receive the sacred seed, be like productive and well-tilled soil, bring forth to God the fruits that will raise you to an incorruptible life.