45 We turn finally to the Tertiaries, both to those who are living together in regular communities and those who live in the world. They, too, should try, with truly apostolic zeal, to promote the spiritual welfare of Christian peoples. Their apostolate which, at its origins, made them worthy to be called by Gregory IX "soldiers of Christ and new Maccabees," will today also, with no less efficacy, succeed in promoting the common good provided they, although they have grown in numbers all over the world, become like their Father, St. Francis, by giving proof of innocence of life and integrity of morals.
Source: Rite Expiatis (Vatican.va)