Laya may mean either the techniques of yoga or (like Rāja yoga) its effect of "absorption" of the individual into the cosmic. Laya yoga, from the Sanskrit term "laya" (meaning "dissolution", "extinction", or "absorption"), is almost always described in the context of other Yogas such as in the "Yoga-Tattva-Upanishad", the "Varaha Upanishad", the "Goraksha Paddhati", the "Amaraugha Prabodha", and the "Dattatreya Yoga Shastra". The exact distinctions between traditional yoga schools are often hazy due to a long history of syncretism, hence many of the oldest sources on Kundalini come through manuals of the tantric and haṭha traditions, including the "Hatha Yoga Pradipika" and the "Shiva Samhita". The "Shiva Samhita" describes the qualified yogi as practicing 'the four yogas' to achieve kundalini awakening, while lesser students may resort solely to one technique or another: "Mantra Yoga and Hatha Yoga. Laya Yoga is the third. The fourth is Raja Yoga. It is free from duality."