Acerba Animi §20

²⁰ And here We recommend anew a point that We have greatly at heart, namely, the necessity of instituting and furthering to an ever greater extent Catholic Action, according to the directions communicated at Our command by Our Apostolic Delegate. This is undoubtedly a difficult undertaking in its first stages, and especially in the present circumstances - an undertaking slow at times in producing the desired effects, but necessary and much more efficacious than any other means, as is abundantly proved by the experience of every nation that has been tried in the crucible of religious persecution.