Nagarjuna was a great scholar who lived during the 1st or 2nd century CE. The main exponent of the Madhyamika school of Buddhist philosophy, he wrote Letter to a Friend, a text focusing on the six paramitas, to his friend, a South Indian king called Surabhibhadra. This is one of the many texts written by him preserved in Tibetan literature, which include several commentaries on sutra, and other important texts on tantra, demonstrating that he himself was practising both. It was he who composed the Mula-madhyamaka-karika which is the foundational text on Madhyamika. It was he who brought the Perfection of Wisdom sutras to the Mahayana tradition. It was mainly an instruction for householders on how to practice dharma.
