Naturalism may refer to:
Realism (arts), naturalism in the arts Naturalism (literature), a literary movement beginning in the late 19th century Naturalism (theatre), a movement in European drama and theatre Naturalism (philosophy), the idea that only natural laws and forces operate in the universe Naturalism (horse) (1988–2018), a racehorseSource: Wikipedia
2. Moral laws do not stand in need of the divine sanction, and it is not at all necessary that human laws should be made conformable to the laws of nature and receive their power of binding from God. (Papal Allocution, Maxima Quidem, 9 June 1862).
3. For you well know, venerable brethren, that at this time men are found not a few who, applying to civil society the impious and absurd principle of "naturalism," as they call it, dare to teach that "the best constitution of public society and (also) civil progress altogether require that human society be conducted and governed without regard being had to religion any more than if it did not exist; or, at least, without any distinction being made between the true religion and false ones." (Papal Encyclical, Condemning Current Errors: Quanta Cura, 8 December 1986).