Being confident (pepoiqw). Second perfect active of peiqw, to persuade. This very thing (auto touto). Accusative of the inner object with pepoiqw, "this thing itself." Will perfect it (epitelesei). Future active indicative of epitelew, will fully (epi-) finish. God began and God will consummate it (see 2 Corinthians 8:6 ; Galatians 3:3 where both words occur together as here), but not without their cooperation and partnership. Until the day of Jesus Christ (acri hmera Cristou Ihsou). The second coming as in verse Galatians 10 . See 1 Thessalonians 5:2 1 Thessalonians 5:4 ; 2 Thessalonians 1:10 ; 2 Thessalonians 2:2 ; 1 Corinthians 1:18 ; 1 Corinthians 3:13 ; 2 Corinthians 1:14 ; Romans 13:12 . Paul never sets the time for the Lord's return, but he is cheered by that blessed hope.