Be not deceived; God is not mocked: for whatever a man sows, that shall he also reap.…
I. Sowing and reaping is an example of a principle seen everywhere in the government of God. An act performed at one time leads to products at a future time. See this exemplified in nature and also in human character.
II. Consider the application of the principle to corrupt human nature: "He that soweth to the flesh shall of the flesh reap corruption." Man, when he comes into the world, has seeds in his very nature, tendencies to act for good and for evil. The tendency to evil grows unless it is restrained. The roots strike themselves deeper into the soil, and the seeds of evil develop in the course of years. See this exemplified in intemperance, in pride, in all temptations and lusts.
III. The application to regenerated nature: "He that soweth to the Spirit shall of the Spirit reap life everlasting." We have seen that in our nature evil propagates itself. But it is equally true that good does so, good purposes, good dispositions, good acts. It increases at compound interest. Every temptation promptly resisted strengthens the will. Every step we take on the ladder upwards helps up to a higher. The new nature is in the form of seeds. Grace grows upon grace. In the same way the Church as a whole grows and increases.
(J. McCosh, D. D.)
Parallel VersesKJV: Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap.