Watchtower, Study Edition, September 2015, "Are You Reaching the Stature that Belongs to Christ?":
Paragraph 6: The mature Christian shows humility in that he recognizes that Jehovah’s ways and standards are always better than his own. [Footnote: For example, older, experienced brothers may be asked to step aside from certain responsibilities and to lend support to younger brothers as they take on those responsibilities.]
He zealously preaches the good news and contributes to the unity of the congregation.