“No one does more harm in the Church than he who has the title or rank of holiness and acts perversely.”
Source: The Book of Pastoral Rule, p.32
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Pope Gregory I 10
Pope from 590 to 604 540–604Related quotes

Cardinal Monterisi in the footsteps of Saint Paul http://www.archivioradiovaticana.va/storico/2011/02/18/february_18,_2011/en1-462779 (12 February 2011)

Source: 1960s - 1980s, MANAGEMENT: Tasks, Responsibilities, Practices (1973), Part 2, p. 398

“The one who acts without knowledge, destroys and ruins more than he rectifies.”
Majlisi, Bihārul Anwār, vol.78, p. 364
Regarding Knowledge & Wisdom, General

“He harms himself who does harm to another, and the evil plan is most harmful to the planner.”
οἷ γ᾽ αὐτῷ κακὰ τεύχει ἀνὴρ ἄλλῳ κακὰ τεύχων
ἡ δὲ κακὴ βουλὴ τῷ βουλεύσαντι κακίστη.
The man who does evil to another does evil to himself, and the evil counsel is most evil for him who counsels it.
He for himself weaves woe who weaves for others woe,
and evil counsel recoils on the counsellor. https://archive.org/stream/b24865898#page/432/mode/2up
Source: Works and Days (c. 700 BC), lines 265-266

“The man who does more than he is paid for will soon be paid for more than he does.”

Source: Civil Government : Its Origin, Mission, and Destiny (1889), p. 49

Full Court Reference in Memory of The Late Justice M. Hidayatullah