This Chapter from Lü Dongbin's The Secret of the Golden Flower discusses the "Hundred Days of Foundation Building," a crucial initial stage in Daoist cultivation. The text emphasizes the natural, spontaneous generation of inner spiritual energy ("true fire") through consistent practice, rather than forced acceleration. While the "hundred days" is symbolic, representing the time needed to establish a firm foundation, the ultimate focus is on achieving efficacy in cultivating inner energy. The text concludes by highlighting the importance of seeking guidance from a true master to understand this profound process.