In these words the Lord explains what the seed is, to wit, the word of the kingdom, that is of the Gospel teaching. For there are some that receive the word of the Lord with no devotion of heart, and so that seed of God’s word which is sown in their heart, is by demons straightway carried off, as it were the seed dropped by the way side. It follows, “That which is sown upon the rock, is he that heareth the word, &c.” For the seed or word of God, which is sown in the rock, that is, in the hard and untamed heart, can bring forth no fruit, inasmuch as its hardness is great, and its desire of heavenly things small; and because of this great hardness, it has no root in itself.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).