Consider that God repeats key things in His Word. Even when we know something, we need reminders and encouragement to be diligent and not stray from the Truth.
Paul instructed Timothy to “remind them” (2Tim 2:14-18).
Being an effective leader requires hard work.
Paul used the terms diligent and worker.
For God’s approval, you’ll need to apply constant care and industry to the study of His Word. This will allow you to give your best to those under your care.