Paul the apostle was held in prison many times, he was possibly chained to a Roman soldier and his mind may have turned his thoughts to the fact that he also was a soldier, a soldier of Christ. The armour of God is an illustration in the word that reminds us about the reality of spiritual battle and describes the protection available to us. It is not a convenient scripture that lends itself to Sunday school classes! Each piece of armour has a distinct purpose and means of defence against temptation and evil. Daily "suiting up" in the armour of God can feel abstract but with prayer and practice, believers can better understand and implement the habit of putting on the full armour of God everyday.