11 There are many ways to come to the aid of the Church. The most useful, in Our opinion, is to establish in each diocese a fund to which the faithful can contribute an annual offering collected by men and women selected from the more noble families, under the orders and direction of the priests. These people should also be the principal givers. They will accomplish this best if they give something from their assured income which is often very considerable, and if from their uncertain income they impose on themselves a contribution like a tax.
Source: Paternae (Vatican.va)