Mark 4:17

Let us, therefore, following the faith of the apostles, hold frequent communion with our Lord. For the world is like the sea to us, beloved, of which it is written, "There go the ships, and Leviathan that you formed to sport in it."17 We float upon this sea, like wind, with everyone directing his own course with his own free will. Under the pilotage of the Word, one may safely approach the port. But, if possessed by wayward inclinations, one is in peril by storm and may suffer shipwreck. For as in the ocean there are storms and waves, so in the world there are many afflictions and trials. The unbelieving therefore, "have no root in themselves, but endure for a while; then, when tribulation or persecution arises on account of the word, immediately they fall away," just as the Lord said. They are not likely to endure the complications which arise from afflictions, if they are fixed upon the temporal and not confirmed in the faith.

(ubi Sup.) There are some who both experience its usefulness and feel a desire for it, but some of them the calamities of this world frighten, and others its prosperity allures, so that they do not attain to that which they approve. Of the first of whom He says, And these are they who fell on stony ground; of the latter, And these are they which are sown among thorns. But riches are called thorns, because they tear the soul with the piercing of its own thoughts, and after bringing it to sin, they, as one may say, make it bleed by inflicting a wound. Again He says, And the toil of this world, and the deceitfulness of riches; for the man who is deceived by an empty desire of riches must soon be afflicted by the toils of continual cares. He adds, And the lusts of other things; because, whosoever despises the commandments of God, and wanders away lustfully seeking other things, is unable to attain to the joy of beatitude. And concupiscences of this sort choke the word, because they do not allow a good desire to enter into the heart, and, as it were, stifle the entrance of vital breath. There are, however, excepted from these different classes of men, the Gentiles who do not even have grace to hear the words of life.

Or, the stony persons are those who adhering a little to the rock, that is, to Christ, up to a short time, receive the word, and afterwards, falling back, cast it away.

Here three classes of people are indicated in whom the word is lost: some are inattentive, these are signified by the phrase "by the road"; others are fainthearted, these are understood by the phrase "on rocky ground"; the third are lovers of pleasure, signified by the phrase "among thorns."