Aeterni Patris

Aeterni Patris (1879)

• Full title: Aeterni Patris: On the Restoration of Christian Philosophy
• Date: 4 August 1879
• Author: Pope Leo XIII

Core themes

• Calls for a renewal of philosophy grounded in the Catholic tradition.
• Strong promotion of St. Thomas Aquinas as a model for theology and philosophy.
• Argues that sound philosophy can:
  • Support and clarify faith
  • Engage constructively with modern science and thought
  • Provide a stable framework against skepticism and relativism.

Lasting impact

• Helped spark the Neo‑Thomist revival in the late 19th and 20th centuries.
• Influenced Catholic seminaries, universities, and magisterial documents that follow a Thomistic framework.
• Set the stage for the Church’s modern emphasis on the harmony of faith and reason.