First, by yourself: Read the following pairs of scriptures, for each pair write a short paragraph - as if it were something you'd share with a friend in a letter. Second: After you've spent some time on this, share with the others in your group what you have written.
I. Acts 24:24-26 & Jude 1:10-13 (this set is a warning):
II. 2 Peter 1:5-11 & Hebrews 12:1-3 (this set is an encouragement):
FYI: Acts 24:25 & 2 Peter 1:6 & Galatians 5:23 are the only scriptures containing "En Kratos" - the Greek word translated as Self-Control.