
The now classicCutting Through Spiritual Materialismis the record of two series of lectures given by Trungpa Rinpoche in 1970-71. "First discussed are the various ways in which people involve themselves in spiritual materialism, the many forms of self-deception into which aspirants may fall. After this tour of the sidetracks along the way, the broad outlines of the true spiritual path are discussed. The approach presented is a classical Buddhist one-not in a formal sense, but in the sense of presenting the heart of the Buddhist approach to spirituality. Although the Buddhist way is not theistic, it does not contradict the theistic disciplines. Rather the differences between the ways are a matter of emphasis and method. The basic problems of spiritual materialism are common to all spiritual disciplines."
Yeah, it's a pretty common trap, the ego has a way of coming in and making you think you're doing some great thing or have accomplished a lot. You can have scammed all these people out of billions of dollars and trick yourself into thinking "well everything is emptiness anyways, it's all good". The best explanation of it I've found of it so far is Chogyam Trungpa's "Cutting Through Spiritual Materialism" [1].
[1] https://www.shambhala.com/cutting-through-spiritual-material...
There are tons of sutras available at Access to Insight [2], which all schools of Buddhism use, but one (the Theravada) uses almost exclusively.
Another book that I found really illuminating was Chogyam Trungpa's "Cutting Through Spiritual Materialism" [3]. It helps point out how the teachings can be put into practice.
[1] https://plumvillage.org/books/the-heart-of-the-buddhas-teach...
[2] https://www.accesstoinsight.org/
[3] https://www.shambhala.com/cutting-through-spiritual-material...
It sounds like you may have had an experience, to some extent, of dwelling in the union of wisdom and emptiness or what some call dharmadhatu [2]. It's not a teaching I encountered until I started practicing Vajrayana, as Theravada teachers don't often emphasize the teachings on sunyata. It's something you'll encounter in Mahamudra and Dzogchen teachings.
[1] https://www.shambhala.com/cutting-through-spiritual-material...
Opening the Heart of Compassion
Both very high in the calling me out on my bullshit metric
In the same vein, the book Karma Cola is still in print after at least 25 years, perhaps over 40 by now.
Also, Shambhala Publications, that published a lot of great Asian poetry in translation and was/is based in Boulder, is not affiliated with this nonsense according to their Wikipedia page.