Christian Acronym :: A.B.C

Place: In a prison (possibly dungeon)
Predicament: In chains, awaiting execution
Poise: Persistent Calm and Cheerfulness

Prescription: A.B.C – Always Be Cheerful (in the Lord).

Paul, a bond servant of Jesus Christ in chains writes and counsels that we ought not to be controlled by our circumstances, no matter how dire the situation may seem, instead we ought to Always Be Cheerful (A.B.C) in the Lord (Philippians 4:4).

Philippians 4:4 (KJV)
4 Rejoice in the Lord always: and again I say, Rejoice.