The best assurance for the future of a church is to have qualified elders who know the truth. Their ability to articulate truth and discern and rebuke errors will keep the church from being capsized. Doctrine, here, is described as healthy (the word from which we get "hygiene.").
The lead characteristic of these leaders is their family. This reinforces for me that each home is a miniature church. Leading at home precedes leading at church. It seems, too, that there are a few things that qualify a leader, but many ways to be disqualified.
We are introduced, too, the theme of Titus -- good works. The problem with bad teaching is not only the teaching itself, but that it produces people unfit for good works. Titus has a results-based view of doctrine.