Sauca

Sauca refers to the purity of body, action, thought, and expression, one of the essential virtues to having access to Jnana(Knowledge)
This refers to the purity of mainly mind and soul, if our mind is pure all our psychophysical spatiality is purified.
Saucha means cleanliness – external as well as internal, both in the body and the mind. The yoga tradition has given great importance to physical and mental health. Without a strong healthy body, it is difficult to take up higher practices of yoga. The body constantly produces waste matter in the form of human waste, urine, sweat, mucus, etc. Cleaning the body of these impurities regularly is essential to avoid infections. Yoga goes one step further and mentions certain techniques to keep the body super clean. These techniques are called Sadkarmas (or the six purificatory methods – Neti, Dhauti, Basti, Nauli, Kapalabhati, and Trataka) and they help in the internal purification of the organs. Through these methods, one also cleans the internal pranic paths or the nadis. Diseases can be caused when organs do not get the required supply of prana. Apart from this, Saucha also means internal purity of the mind. The mind should be engaged in positive thoughts, which leads to peace and harmony. In the science of Ayurveda, it is said that negative thought patterns affect the body in a long run and lead to diseases in the future. Thus, cleanliness of both body and thoughts is essential for good health.