Gregory IX, Pope. [Letter to Agnes of Prague, 1238 (5)] in Bullarium Franciscanum Romanorum Pontificum 1.242-44

[Letter from Pope Gregory IX to Agnes of Prague]
The pope tries to dissuade Agnes from her desire to follow Francis's rule more strictly and urges her to accept his directions for more moderation, encouraging her to move even further in that direction.
Online at Epistolae (See also Bibliographia record).