And my speech and my preaching was not with enticing words of man's wisdom, but in demonstration of the Spirit and of power: My speech - in private.
Preaching - in public (Matthew 10:27). Or, discourse on doctrines; preaching, literally, heralding, of facts.
Enticing - Greek, persuasive.
Man's wisdom - "man's" is omitted in B Delta G f g: retained in 'Aleph (') A C.
Demonstration of the Spirit ... Persuasion is man's means of moving his fellow-man. Ministers should rather seek God's, which is demonstration, inspiring implicit faith by the power of the Spirit (then exhibited outwardly by miracles, and inwardly by working on the heart, now in the latter only, the more important way) (Matthew 7:29; Acts 6:10; Romans 15:19).