'Sonship' is an important, yet often overlooked, theme throughout the Bible. Adam, the first human being, is identified as a 'son of God'; Israel is God's 'first-born son'; the covenant with king David is cast in father-son terms; Christians are children of God, 'adopted as sons'; and the same designation brings Scripture to a triumphant conclusion: 'He who overcomes will inherit all this, and I will be his God and he will be my son' (Revelation...