Pope John XXIII
Pacem in Terris §161
Pacem in Terris: On Establishing Universal Peace in Truth, Justice, Charity, and Liberty
161 There are indeed some people who, in their generosity of spirit, burn with a desire to institute wholesale reforms whenever they come across situations which show scant regard for justice or are wholly out of keeping with its claims. They tackle the problem with such impetuosity that one would think they were embarking on some political revolution.
Source: Pacem in Terris (Vatican.va)