If we have sown unto you spiritual things,.... The preachers of the Gospel are compared to sowers of seed; the seed they sow is the word of God, which is like to seed, for its smallness and despicableness in the eyes of carnal men; and yet as the seed is the choicest which is laid by for sowing, the Gospel is most choice and excellent to true believers; like seed, it has a generative virtue through divine influence; and whereas unless sown into the earth, it brings forth no fruit, so neither does the word, unless it has a place in the heart, where, as seed in the ground, its operation is secret, its increase gradual, and its fruitfulness different.
The ground they sow upon is, very various; some of their hearers are like the wayside, careless, ignorant, and on whom no impression is made; others are like the stony ground, who though for a while they express some affection and liking, yet not having the root of grace in them, whenever persecution arises, forsake the hearing of it; others are like the thorny ground, which are at first very promising, and greatly reformed, but inwardly full of the cares and lusts of the world, which choke the word, and make it unfruitful; and others are like the good ground, who are made good by the grace of God, understand the word, receive it, hold it fast, and in whom it is fruitful: sowing requires skill and art, and so preaching the Gospel does, and that more than human; and is constantly in its returning season to be attended to, notwithstanding the winds and clouds, and so the ministry of the word, notwithstanding all reproaches, persecutions, and afflictions; and as the same sort of seed, without mixture, and in plenty, is to be cast into the earth, so the same pure and unmixed Gospel of Christ is to be preached, and that without keeping back any thing that is profitable: and once more, as the sower, when he has cast his seed into the earth, waits long and with patience for its springing up and increase, so do the faithful dispensers of the Gospel: and what they sow or minister is of a spiritual nature; it comes from the Spirit of God, he is the dictator of it; he by his gifts qualifies men to preach it, and by his power makes it effectual to the souls of men; and through it conveys himself to them, as a spirit of regeneration and sanctification: the matter of the Gospel is spiritual; it contains spiritual doctrines, such as justification, pardon of sin, adoption, regeneration, &c.
and are what concern the souls and spirits of men, and their spiritual and eternal welfare:is it a great thing if we shall reap your carnal things? meaning temporal ones, what concern the flesh, the body, the outward man, and the support thereof.
The argument is from the greater to the less, and much the same with that in Ro 15:27.