This work addresses the theme of the principle of pluralism of ideas and pedagogical conceptions provided for in sub-section III of Article 206 of the Federal Constitution of 1988 and in sub-section III of Article 3 of the Law of Directives and Bases of National Education (law 9394/96). The interest in the theme emerges from my experience as legal adviser to the Federation of Waldorf Schools of Brazil, which made me face the greatest juridical-educational challenge of my life, that is, how to preserve intact the foundations of a certain pedagogical conception when faced with changes in legislation that collide with the aforementioned pedagogy. The research problem arises from this reality: to verify whether the constitutional principle of pluralism of ideas and pedagogical conceptions serves as a legal support to a particular pedagogical proposal, in the face of subsequent changes in the Law of Directives and Bases of National Education that contradict assumptions of that pedagogical proposal?