Maitripa was a great Indian master who was a contemporary of Naropa and he was regarded as highly knowledgeable on the Buddhist view. For this reason, Naropa told Marpa that he should not get the view from him, but from Maitripa. Thus Maitripa became regarded as the source of the view for the Kagyu lineage. Maitripa is also famous for having re-discovered the Uttaratantra shastra of Maitreya which had been lost until that time. He is a central figure in the transmission of what is called "the profound meditation system of Maitreya." In many ways, he was also the source of the Shentong, or Other Emptiness (gzhan stong) style teaching of Maitreya and Asanga that came into Tibet.
A number of Maitripa's writings were included in a compilation of important Indian Buddhist texts which is simply called "The Main Texts of India". It is a very old compilation, dating from the early days od the second wave of dharma that came into Tibet. Maitripa's writings are mostly very short and pithy and have the quality of oral teaching. These writings always deal with the view and are very important to followers of the Other Emptiness teaching because they definately show the view.
This book is a compilation of several of those writings. They were selected from the whole set of Maitripa's writings because they very clearly show his presentation of the Other Emptiness view in both sutra and tantra contexts. There are texts on Madhyamaka, Co-emergence, Chakrasamvara practice etc.The book has the texts in translation with a full set of notes and commentary by the author to make the meaning of the very terse writing clear.