For he that sows to his flesh shall of the flesh reap corruption; but he that sows to the Spirit shall of the Spirit reap life everlasting.
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Augustine of Hippo
AD 430
To sow in the spirit is to serve righteousness from faith and with love and not to heed the desires of sin, even though they arise from mortal flesh…. When we are under grace, we sow in tears, when desires arise from our animal body, which we resist by not consenting, so that we may reap in joy. We reap when, by the reformation of our body, no vexation or peril of temptation comes to trouble us from any physical source.
"For he that soweth to the Spirit, shall of the Spirit reap life everlasting. And let us not be weary in well-doing.".
"He that soweth to his flesh, shall of the flesh reap corruption; but he that soweth to the Spirit, shall of the Spirit reap life everlasting."
For he that soweth to his flesh shall of the flesh reap corruption. He who does carnal works, and casts them as it were seed into his flesh, shall of this carnal seed reap death now and hereafter. The reference is chiefly to sins of gluttony and impurity. On the other hand, those who sow spiritual things strengthen the spirit within, and shall reap life everlasting.
But although the phrase is couched in general terms, the Apostle"s immediate reference is to the works of beneficence done by catechumens for their teachers. In either case the meaning is the same.
He that soweth in his flesh The apostle represents the flesh and the spirit like two fields, on which men sow good or bad seed, according to which they shall reap. (Witham)
All that we say, do or think is sown in two fields, the fallen nature and the Spirit. If what comes from our hand, mouth and heart is good, it is sown in the Spirit and will produce fruits of eternal life. If it is bad, when harvested from the field of the sin nature it will produce an unsavory crop of corruption for us…. It should be observed that to the one who sows in the flesh is given an additional term, “in his flesh.” But the one who sows in the Spirit is said not to sow in his spirit but simply “in the Spirit.” For the one who sows good things sows not in his own spirit but in God’s, from whom he will also reap eternal life. .