Verse  examines what you and I must believe. Notice the emphasis on “sound doctrine”. This is the content of the faith. Christians, like myself, must be founded in the truths in the Bible – then we won’t be swayed by the powerful oratory of false teachers, the devastation of tragic circumstances, or wide swings of emotion. We have to continue to learn the Word, apply biblical principles to our life, communicate the behaviour that goes with sound teaching, and more importantly walk what we have learnt and talked.
Verse  examines how we must behave. Older men are to be temperate, dignified, self-controlled, sound in faith, in love, and in endurance. Older people ( inclusive of older women ) are to exhibit the right behaviour and to teach the younger, by words and by example. In this verse, Paul was urging Titus (and to us as well) to be a good example to those around him so that others might see his good deeds and imitate him. His ( our ) life would give his ( our ) words greater impact. If we want someone to act a certain way, be sure that we live that way ourself. Then we will earn the right to be heard.