Magnifica Humanitas is the first papal encyclical written explicitly with synthetic intelligence in mind. It does not condemn AI, and it does not endorse it. What it does is set out red lines: machines must not adjudicate human worth, displace the worker without recourse, mediate the sacraments, or be permitted to wage war autonomously. The argument is grounded less in scripture than in 19th-century labour theology — Rerum Novarum updated for an era where the loom is a transformer.

Whatever you think of the institution, the document is unusually concrete for a moral text. It calls on Catholic universities, hospitals and dioceses to publish AI usage policies, and on Catholic-affiliated investors to apply a 'discernment screen' to AI portfolios. Expect long quoting in policy papers, court filings and union briefs for years. The HN thread is a fascinating split — sceptics, theologians, people who work at frontier labs, and a Vatican press officer answering questions in real time.