... This insufficiency of he gospel is surely why Paul, when writing to Timothy, does not simply tell him to preach the gospel. Yes, he certainly does tell him that; but as the aging apostle looks at the world around him and wonders how the gospel is to be preserved after the first generation of leaders directly commissioned by Christ dies out, he also tells Timothy to find ordinary men to appoint as elders. In other words, Paul sees that a church structure, as well as a church message, is vital to the safeguarding and propagation of the gospel.
For Paul, the gospel is not in itself sufficient to ensure the continuation of the gospel. It needs men to preach it; it needs men, women and children to tell it to their friends. And because all of these agents are fallen, it needs a church structure to help to safeguard its content.
This is not to say that preaching the gospel is rocket science. One error we can make is to assume that only a few, highly skilled individuals can preach the gospel. The world is full of very good gospel preachers who, for one reason or another, nobody has ever heard of beyond their local congregations. I enjoyed T4G last week but (without any disrespect to the men who spoke at the plenaries) I can name a dozen men who are just as fine at gospel exposition but who will never be on a giant stage or preach to more than a maximum of a few hundred people -- often much fewer -- on a Sunday . Preaching is not an arcane skill given only to a score or men worldwide. If it were, Paul would have told us. In fact, he does not say to Timothy, 'Find a few highly skilled men with media clout and hand the matter over to them.' Not at all. What he essentially says is 'Find men in your congregation who are trustworthy and true who, if they have families, have run their households well, who have a good track record within the church, who are respected by outsiders and who are competent to teach - and trust them with the gospel.'
Or Paul could have laid out sixteen requirements for making a sermon interesting for a Q school.