This text explores the etymological and philosophical investigation of conceptual pairs that define human conduct and characteristics. The author focuses on comparing two specific opposites in the Czech language: "right/wrong" (pravý/nepravý) and "clean/unclean" (čistý/nečistý). The former pair exhibits an extraordinary etymological unity in Czech, connecting spatial orientation with concepts of law, justice, and morality. Conversely, the "clean/unclean" pair spans a range from physical and ritual purity to spiritual integrity. A key distinction identified is that cleanliness lacks an inherent corrective mechanism and can escalate into obsession unless moderated from an external perspective. The text argues that the metaphorical meanings of purity are less precise than those of "rightness," leading to a lesser philosophical significance. Consequently, the cluster of terms derived from the right/left (wrong) distinction provides a more robust conceptual foundation for philosophical reflection than the concept of purity. The analysis concludes that the etymological roots of "rightness" offer greater clarity and reach across various dimensions of reality compared to the more ambiguous notion of cleanliness.