The Four Yogas: A Guide to the Spiritual Paths of Action, Devotion, Meditation and Knowledge
Adiswarananda · ★★★★☆ · 314 pages · 2006
The Four Yogas divides the four Yogas of Karma (Action), Raja (Meditation), Bhakti (Devotion), and Jnana (Knowledge). While the ideal is that any one path taken leads to the same goal each path has its own set of practices and obstacles that Swami Adiswarananda covers thoroughly.
While we may be driven by any of the particular path the other three should always be there to support the path taken. Unfortunately, this book does no synthesis on how to combine the different paths together and I am assuming this is because it is a personal choice.
One thing that is common in every path is the need for meditation. The object of meditation may differ but each path basically seems to need the Yoga Sutras of Patanjali as a framework for meditation. The Jnana path seems to my amateur mind indistinguishable from Vipassana meditation of Buddhism though with a focus on knowledge instead of experiencing of non-self.
Anyways, the book was a good synthesis of the four yogas but it does require some background before reading as it is definitely not written for someone who has not read the Four Yogas of Vivekananda.