This article shows that all wars are the result of man's sinful nature; however, war is not outside God's power. God uses war to judge one nation against another. They also remind us of the horrors of sin, and the fact that peace is dependent upon God.
John 10 outlines for us Christ's qulifications as our Good Shepherd. Christ is approved by God, gave His life for the sheep, knows His sheep, will bring His sheep to the fold, and will not lose even one of His sheep.