6:6 One important way to bear other believers' burdens (v. 2) is to share in all good things, including financial support, with one who teaches God's word. After all, teachers and preachers work hard in their ministry (see 1 Tim. 5:17).
6:7,8 The principle of sowing and reaping was known to everyone in a largely agricultural society. It is a vain attempt to "mock" God for a Christian to think that if he sows to his flesh he can escape the harvest of destruction and judgment that comes upon those who participate in sin (5:19-21; Hos. 8:7). Corruption is a term used for a field in which the produce is too rotten to harvest (see Heb. 6:8). Some interpret corruption to imply eternal destruction, either through losing salvation or through never having been truly saved at all. Others understand a tragic loss of rewards for the carnal believer (see 1 Cor. 3:12-15; 2 Cor. 5:10; Rev. 22:12). He who sows to the Spirit will . . . reap everlasting life does not mean that eternal life is earned by works. Rather, Paul is saying that everlasting life is the glorious end of those who follow the guidance of the Spirit (see Rom. 6:22).
6:9 In this verse, Paul speaks of doing good. The apostle has argued at length that such works cannot justify (2:16) or sanctify (3:3) anyone. However, good works are, in fact, an important fruit of the life of faith (5:5) that God has planned for each believer (see Eph. 2:8-10). In 5:19-23, the apostle describes the attitudes and actions of those controlled by the "flesh" versus those controlled by the Spirit. In vv. 7-9, Paul shows the impact of those two contradictory ways over the length of a Christian's life (see 2 Cor. 5:10; Rev. 22:12).
6:10 Therefore indicates that this verse speaks of an important application of the spiritual sowing and reaping process (vv. 7-9). Christians are not only to serve one another in love (see v. 2; 5:13), they also should do good to non-Christians.
[THE NKJV STUDY BIBLE Second Edition].
JESUS IS LORD.