Lovely.
I will recommend this as a companion to The Calm Technique for people who are interested in learning mantra practice but don't for whatever reason want to go to a teacher for a mantra. The Calm Technique is really good on... technique. But it lacks the cultural context and the sweet devotional feeling that this book adds to the subject.
I enjoyed learning a bit more about Easwaran, having been exposed to his work on sacred texts without knowing so much about his background. His experience of growing up Hindu in Kerala state, then later going to Catholic school where Hindus were seen as inferior and most fellow students had more preparation in English, becoming beguiled by western culture and rationality to the point of becoming a teacher of English, and then much later as an adult returning to the devotional values of his family... all of this really helps me understand why his voice emerged as so important in helping western-minded students understand the Indian tradition at the end of the 20th century. His erudition and generosity of spirit are not, of course, explained by his life experience... but they certainly come through here, as in everything he's written.
This really feels like a voice from the late 1970s - Easwaran takes pains to credit a variety of religious traditions, making the argument that there is a common core in all faiths. I suppose he had a lot of hippie readers who were alienated from Christianity, or Christian readers alienated from eastern faiths... in any case he has done a lot of work and research to get various traditions sort of talking to each other. Not such a popular project these days. It's really enjoyable to read an author who can so easily draw from Ramakrishna or the Old Testament from page to page. His section on various sources (Greek, Russian, North African) of the Jesus prayer was wonderful, and great learning for me.
For people who do well with mantra meditation, this will be a loverly resource, especially because it's easy to read, leaves you with a sweet taste, and gives a good level of context on the topic. Later teachers have been more precise about technique. This is where I'd say The Calm Technique is an especially good resource - systematically setting a person up for precision in practice and answering common questions. Shinzen Young's work on what he calls "mindful mantra" is also good, particularly helping people who are more self-taught avoid just spacing out or just hypnotizing themselves.
Easwaran anticipates these exact technical issues too, as would anyone who has been around a lot of mantra practitioners I suppose. But people who really do a mantra practice for life will probably benefit from more support in the long run - and the ability to talk directly to experienced teachers - to make sure it's not having these common unintended effects.