The term ‘adoption’ (used here in older English versions [of Romans 12:15] may have a somewhat artificial sound in our ears; but in the Roman world of the first century AD an adopted son was a son deliberately chosen by his adoptive father to perpetuate his name and inherit his estate; he was no whit inferior in status to a son born in the ordinary course of nature, and might well enjoy the father’s affection more fully and reproduce the father’s character more worthily.
Tyndale New Testament Commentary: Romans, Vol.6, InterVarsity Press, 2008.
