Read in order, the five niyamas describe a trajectory rather than a checklist. Saucha, purity, is where a practitioner necessarily begins: the body washed, the food clean, the surroundings ordered, and then the harder interior scrubbing of envy, deceit and pride. Santosha, contentment, follows because a cleaned life exposes how much of ordinary unhappiness is manufactured by wanting; Patanjali attaches to contentment the largest reward in the list, unsurpassed happiness. Tapas, austerity, then adds heat: deliberately chosen difficulty, fasting, vigil, endurance, the discipline that burns impurity the way fire refines metal. Svadhyaya, self-study, turns the practitioner toward scripture and mantra, and through them toward the patterns of their own mind.
Ishvarapranidhana, surrender to the Lord, ends the list by giving the whole enterprise away: practice done without claim on its fruits, dedicated to something the practitioner does not control. The commentators noticed that the sequence moves steadily inward and upward, from skin to mind to text to God, and that its last three members are exactly Patanjali's kriya yoga. The niyamas are thus the eight-limbed path in miniature: begin by washing, end by letting go, and let each observance make the next one possible.