The Apostle Paul
Galatians 6:8ESV·traditional attribution

For the one who sows to his own flesh will from the flesh reap corruption, but the one who sows to the Spirit will from the Spirit reap eternal life.

John Calvin Reformed @genevareformer

8. For he that soweth to his flesh. Having stated the general sentiment, he now divides it into parts. To sow to the flesh, is to look forward to the wants of the present life, without any regard to a future life. They who do this will gather fruit corresponding to the seed which they have sown, — will heap up that which shall miserably perish.

Matthew Henry Presbyterian @wholebiblehenry

The apostle having, in the foregoing chapter, exhorted Christians by love to serve one another (Gal 6:13), and also cautioned us (Gal 6:16) against a temper which, if indulged, would hinder us from showing the mutual love and serviceableness which he had recommended, in the beginning of this chapter he proceeds to give some further directions, which, if duly observed, would both promote the one...

Commenting on Galatians 6:1-10

John Gill Reformed Baptist @doctorgill

And let us not be weary in well doing,.... This may be understood of well doing, or doing good works in general, of every sort; which are such as are done according to the will of God, from a principle of love to him, in faith, and in the name and strength of Christ, and with a view to the glory of God: or else...