29 Fortunate the Church, indeed, if thus it will lay its "foundations with sapphires" (Cf. Isaias liv: 11). The needs of our times then require that the laity, too, and especially those who collaborate with the Hierarchy of the Church, procure for themselves a treasure of religious knowledge, not a poor and meager knowledge, but one that will have solidity and richness through the medium of libraries, discussions and study clubs; in this way they will derive great benefit for themselves and at the same time be able to instruct the ignorant, confute stubborn adversaries and be of assistance to good friends.
Source: Sertum Laetitiae (Vatican.va)