to. Supply the ellipsis by "for".
edification. Literally building. Greek. oikodome. See 1 Corinthians 3:9. Here used metaphorrically.
exhortation. Greek. paraklesis. See Acts 4:36 with Acts 13:15. Compare App-134.
comfort. Greek. paramuthia. Only here. Compare Philippians 1:2; Philippians 1:1, and the verb in John 11:19.