To meditate on the nature of mind is the swift, effortless path for all who seek enlightenment. This direct instruction unifies the key points of all Sutra and Tantra; it is the experience of all realised masters and the enlightened intent of all buddhas. Therefore, we need to practise it earnestly and continuously. One of the most eminent lamas in Tibet, Dzogchen Pema Kalsang Rinpoche is widely recognised as a brilliant scholar and highly realised master of the Great Perfection. In this faithful translation of his commentary on Mipham Rinpoche's Lamp to Dispel Darkness, Dzogchen trekcho meditation is explained in clear and experiential language for the benefit of true practitioners. Also included is the full Tibetan text. These profound instructions may only be read by those who have been authorised and empowered into the main Dzogchen practices by a genuine master.