Sonship

Dictionary of Biblical Words:

A distinctive Christian privilege. All believers in all times are children of God, but it is reserved for Christians to become “sons” by adoption (see &c.), and to be able and entitled to cry “Abba, Father.” In an Oriental household this is more readily understood than in England; there there might be fifty children, most in the position of domestic servants, one alone being chosen as “son” and heir, so Isaac, &c. See CHILDREN.