29 In order to achieve this purpose, it is hardly sufficient for new Christian communities to convert men to the Catholic religion and, after purifying them with the water of Baptism, to number them among the members of the Church; it is altogether necessary, after giving the individual a Christian education suitable to his circumstances and times, to make him capable of promoting, as much as he can, the present and future good and growth of the Church. The sheer number of Christians means little if they lack virtue; that is, if, while enjoying the name of Catholic, they do not stand firm in their determination; if their spiritual life does not flourish and fails to produce wholesome fruits; if, after being reborn to divine grace, they do not excel in that spirit of vigorous and sensible youthfulness which is always ready to perform generous and useful deeds. Their profession of faith must not only be a statistic in a census, but must create a new man, (50) and give all his actions a supernatural strength, inspiring, guiding, and controlling them.
Source: Princeps Pastorum (Vatican.va)