Kundalini Yoga as taught by Yogi Bhajan adheres to the three pillars of Patanjali's kriya yoga system – discipline ("tapaḥ"), spiritual study ("svādhyāya"), and devotion to God ("iśvarapraṇidāna") (PYS, II:1) – but it does not condone extremes of asceticism or renunciation. Yogi Bhajan encouraged his students to marry, establish businesses, and be fully engaged in society. Rather than worshiping God, Yogi Bhajan's teachings encourage students to train their mind to experience God. Yogi Bhajan sometimes referred to the Sikh lifestyle as "Raja Yoga", the yoga of living detached, yet fully engaged in the world. In respect of the rigor of his teachings, Yogi Bhajan claims kinship with other 20th century Sikh sadhu saints, such as Sant Baba Attar Singh, Sant Baba Nand Singh ji, and Bhai Randhir Singh.