Innocent IV, Pope. [Letter to Agnes of Prague, 1243 (2)] in Bullarium Franciscanum Romanorum Pontificum 1.315-17

[Letter from Pope Innocent IV to Agnes of Prague]
The pope writes in response to Agnes's anguish about discrepancies between the Rule of St. Benedict and the principles of Francis and his followers. The pope argues the problems and dangers of having different houses in the same order following different rules.
Online at Epistolae (See also Bibliographia record).