…but hospitable, loving what is good, sensible, just, devout, self-controlled…
Titus 1:8 (emphasis mine)
To be devout is to be holy, pious, pleasing to God.
Paul uses this same word when instructing men to pray:
Therefore I want the men in every place to pray, lifting up holy hands, without wrath and dissension.
1 Timothy 2:8
The idea is that the elder, and all Christians, ought to have an inward purity that is demonstrated by outward actions. The Pharisees were able to give appropriate instructions to others, but they were unwilling to live out the very truths they taught.
…therefore all that they tell you, do and observe, but do not do according to their deeds; for they say things and do not do them.
Paul reminds Timothy that his doctrine and life must match. This is absolutely essential for those who serve as elders.
Pay close attention to yourself and to your teaching; persevere in these things, for as you do this you will ensure salvation both for yourself and for those who hear you.
1 Timothy 4:16