97 The scope and aim of Christian education as here described, appears to the worldly as an abstraction, or rather as something that cannot be attained without the suppression or dwarfing of the natural faculties, and without a renunciation of the activities of the present life, and hence inimical to social life and temporal prosperity, and contrary to all progress in letters, arts and sciences, and all the other elements of civilization. To a like objection raised by the ignorance and the prejudice of even cultured pagans of a former day, and repeated with greater frequency and insistence in modern times, Tertullian has replied as follows: We are not strangers to life.We are fully aware of the gratitude we owe to God, our Lord and Creator. We reject none of the fruits of His handiwork; we only abstain from their immoderate or unlawful use. We are living in the world with you; we do not shun your forum, your markets, your baths, your shops, your factories, your stables, your places of business and traffic. We take shop with you and we serve in your armies; we are farmers and merchants with you; we interchange skilled labor and display our works in public for your service. How we can seem unprofitable to you with whom we live and of whom we are, I know not.
Source: Divini Illius Magistri (Vatican.va)