Geshe Rabten is one of the first to bring Mahayana to the West, AND was a guru of Lama Yeshe and Lama Zopa. This book compiles his teachings during a week long retreat in Switzerland in the 70s. I gained a lot out of this small book, even if the topics weren't new to me. I particularly liked his samatha advice
I will highly recommend this to anyone who is new or interested in Tibetan Buddhism.