Charles Ellicott Commentary Galatians 6:8

"For he that soweth unto his own flesh shall of the flesh reap corruption; but he that soweth unto the Spirit shall of the Spirit reap eternal life." — Galatians 6:8 (ASV)

He that soweth to his flesh.—The seed sown is a man’s actions here on earth. If the object of those actions is merely self-indulgence, they are, as it were, sown in a field whose owner is the flesh (i.e., the lower, carnal self). The flesh alone benefits by them, and for it alone are they stored up.

Shall of the flesh reap corruption.—If such has been a man’s conduct, he must look to the flesh for his reward, and all the reward it can give him will be a share in its own corruption. The flesh perishes, and so too will the fruit of his actions perish, and “leave no ruin behind.”

He that soweth to the Spirit . . .—On the other hand, where all the actions are like seed deposited in the field whose owner and lord is the Spirit, that same Spirit will reward them in the world to come with the gift of everlasting life.