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John Paul's relevant text on proximate preparation:

"The religious formation of young people should be integrated, at the right moment and in accordance with the various concrete requirements, with a preparation for life as a couple. This preparation will present marriage as an interpersonal relationship of a man and a woman that has to be continually developed, and it will encourage those concerned to study the nature of conjugal sexuality and responsible parenthood, with the essential medical and biological knowledge connected with it. It will also acquaint those concerned with correct methods for the education of children, and will assist them in gaining the basic requisites for well-ordered family life, such as stable work, sufficient financial resources, sensible administration, notions of housekeeping." (FC 66)