These instructions are an overall exhortation for the various age groups to hold to a sense of duty with regard to their conduct. But none of the instructions given here should be ignored simply because they are not addressed directly to an individual's sex or age group. For example, Paul says "girls should be discreet and modest." Does this mean, then, because it is addressed to girls that a fellow may be as indiscreet and immodest as he wants because he is male? Simply because the fellows are not mentioned does not excuse them from being discreet and modest as well. In an overall sense, God is telling all of us—parents, young people, male, female—to be sane, sober-thinking, serious about our responsibilities, exercising self-control, curbing our passions, and aiming for self-mastery.
There is a proverb that teaches: "He that rules his spirit is better than he who takes a city." Ruling one's spirit involves self-discipline. Self-discipline is willing yourself to do the right, regardless of feelings. It may not be glamorous, but it is the stuff of life.
John W. Ritenbaugh
Sanctification and the Teens
God obviously saw the ongoing need within the church to have clear leadership and education, not only from ordained elders, but also from the older, more experienced, God-fearing people in the church, who should lead by example and exhortation. It is a major responsibility that God expects from all involved, both from those teaching as well as from those being taught.
Precious Human Treasures
Paul's repeated emphasis on sound doctrine implies that the body of teaching in the church is more than just a gospel about Christ. It is the gospel of Christ—what He taught and lived in His own life, and what He expects us to follow as well. His doctrine is "the pattern of sound words," the body of truth, once for all delivered to the saints. God inspired the writers of the New Testament to warn us that His church must have a solid foundation in the truth of Christ to defend and contend for the faith because of the constant bombardment of false doctrines.
Martin G. Collins
Basic Doctrines: Doctrine