Avadhuta Gita
The Art of Communicating: Thich Nhat Hanh
Open to other recs for non dual meditation / spirituality without a lot of religious dogma.
I read it some years ago, so don't remember for sure about the dogma bit, but it likely does not have much of that.
https://en.m.wikipedia.org/wiki/Passage_Meditation
https://en.m.wikipedia.org/wiki/Eknath_Easwaran
Avadhuta Gita
The Art of Communicating: Thich Nhat Hanh
Open to other recs for non dual meditation / spirituality without a lot of religious dogma.