Mark Driscoll @ the Resurgence:

Furthermore, in some sense, every Christian is to be a teacher who imparts biblical truth into the lives of others. For example, Colossians 3:16 is directed to an entire church: “Let the word of Christ dwell in you richly as you teach and admonish one another with all wisdom, and as you sing psalms, hymns and spiritual songs with gratitude in your hearts to God.”

I think too many people pass this work off to others – their ministers, Sunday School teachers, and small group leaders – saying they don’t know enough, or it’s not their role.  But we all share this role, and not knowing enough is no excuse…learn it.