“Encourage the young men to be self-controlled. In everything set them an example by doing what is good.”
There is some teaching involved in learning to be self controlled but most of it is example and simple encouragement.
Why encouragement? Young men need courage to live counter to the culture. They need to know and experience others cheering them on.
Why example? Young men also need a compelling example. Teaching falls short without real personal examples of how the Scriptures are applied in everyday life.
Encouragement & Example are two things anyone can do and thus anyone can spiritually reproduce!
QUESTION: Who is encouraging you in your faith? Who are you encouraging?