Most people view sin as a private or earthy matter. Yet, every sin is against the Lord. In truth, men can sin against the Father, the Son, and the Spirit.
Many people use time set aside for rest to do things that deprive of rest. This compounds the need for rest and the problems associated with not getting any.
At times, God called people to enter into war with the goal of killing their enemies. The Bible clearly distinguishes between this type of killing and murder.
