The Yamas, the first of Patañjali’s Eight Limbs of Yoga as outlined in the Yoga Sutras, are a practical guide to integrating the mind with the life force (Prana) that moves through all of creation. Patañjali doesn’t teach us from a moral point of view; rather, he simply points out that if we wish to reach the highest level of connection and concentration, Samadhi, we must remove any separation between the mind and this universal energy.
The Yamas, together with the Niyamas, are often called the “Ten Commandments” of yoga.