The phrase "elementary principles" refers to basic or fundamental principles. These are the basic concepts or ideas that serve as the foundation or starting point for a subject or field of study. Full definition
It is sentimental; it implies the superior - inferior relationship; and if the sheep is presumed to be injured, it violates the most elementary principle of first aid. (religion-online.org)
Among the most elementary principles of Western Civilization is the truth that laws which violate the moral law are null and void and must in conscience be disobeyed. (firstthings.com)
It operates from elementary principles of the artist's devising, indebted to traditional Chinese landscape painting but richer and more fanciful than that; more private and rooted inside her own head. (twocoatsofpaint.com)