Dorje Senge (Diamond Lion) lived from (1054-1123) and is the author of one of the most famous buddhist texts for developing a good heart (lojong) called the Eight Verses. It’s full of very practical advice for being a kinder and more compassionate person. Diamond Lion was one of the Kadampas, who were the first generation Buddhists in Tibet. Lojong texts for developing a good heart were very popular amongst the Kadampas. He is also called Geshe Langri Tangpa, after the plains of Langri, which is his native region. He was a sempa chenpo, a highly realized bodhisattva.