In Hac Tanta §11

¹¹ We find here and there pairs of documents which attest to the uninterrupted exchange of letters and the remarkable agreement of wills between this valiant preacher and the Holy See, an agreement continued by four successive popes. The popes always helped and favored him. Boniface, on his part, neglected nothing, and abandoned none of his zeal nor efforts to fulfill the mission he received from the popes he venerated and loved as a son.