1:6 will perform it. It is neither our responsibility nor within our capability to maintain ourselves in a state of salvation. God began this work in us (Ephesians 2:8), and He will assure its continuance.

1:6 day of Jesus Christ. The “day of Jesus Christ” (I Corinthians 1:8; 5:5; II Corinthians 1:14; Philippians 1:10; 2:16; II Thessalonians 2:2) is the day when Christ returns for His people (John 14:2-3).

6 the communication. The Greek word for “communication” here is koinonia, meaning “fellowship.” The word for “effectual” is energes, meaning “energizing.” Thus true Christian fellowship becomes powerful when it is not mere socializing, but rather a time of thankfulness and sharing. In context here, it might cost Onesimus his freedom, Paul his helper and Philemon his property.