The full title is Traveliing the Path of Compassion: A commentary on the 37 Practices of a Bodhisattva by Ngutchu Thogme.

A Buddhist is encouraged to develop compassion as an important part of their religion. A person who does this can follow the bodhisattva way and become a bodhisattva. The 37 practices are an excellent way to do this because it is made up of just 37 verses and then is fallowed by the Karmapa's excellent and very understandable commentary on these 37 verses.