Śauca (purity) is twofold: external (bāhya) through earth and water (mṛjjalābhyām), and internal (ābhyantara) through purification of the mind (manaḥśuddhi). This dual framework — physical and mental cleanliness — parallels the yoga understanding that outer impurity reflects and reinforces inner impurity, and that both must be addressed. Physical purification (śauca) supports but cannot substitute for the inner work.