A.T. Robertson Commentary 2 Corinthians 8:6

"Insomuch that we exhorted Titus, that as he made a beginning before, so he would also complete in you this grace also." — 2 Corinthians 8:6 (ASV)

Insomuch that we exhorted Titus (εις το παρακαλεσα ημας Τιτον). Use of εις το and the infinitive for result with accusative of general reference (ημας). See Robertson, Grammar, p. 1003.

He had made a beginning before (προενηρξατο). First aorist active indicative of the double compound verb προ-εν-αρχομα, still found only here and verse 10, to make a start before others.

Complete (επιτελεσε) First aorist (effective) active subjunctive of επιτελεω, to finish, with perfective use of επ in composition.