Adoption was clearly not a foreign concept in the Greco-Roman world. But it’s important to note how differently Paul and his communities would have heard that word! Our contemporary concept of adopting an infant, with the connotations of nurture, care, and compassion, is, in fact, anachronistic.
The common understanding of adoption in the Greco-Roman world would have been functional: it was a tool of the elite (especially the emperors) to secure succession, legacy, and inheritance. Adopted sons were pulled into a bigger story and expected to fulfill an imperial purpose. In those times, adoption was about the coalescing and movement of power, not the rescue of orphans.
