Ephesians 6:10

(6:10) Our strength is ultimately "in the Lord". This verse recognizes that our human strengths have no substance in God's realm nor in the sphere of Christian service. It is "His mighty power" that we weld and not our own pitiful human influence. The key to humility rests on our understanding of this principle. As we mature in age and knowledge and gain skill in dealing with people, it is increasingly difficult to remember that our skill is humanly engineered and is strength of the old nature. One good test is this; if the same thing can be accomplished by an unbeliever, then it is not based in the transforming power of the Holy Spirit.