The four establishments of mindfulness and its sutta history - as well as the Bhikkhunupassaya Sutta - Directed and Undirected Meditation (SN: 47:10). Suttas available here: https://a-buddha-ujja.hu/sn-47.3/en/bodhi) and here https://www.accesstoinsight.org/tipitaka/sn/sn47/sn47.010.olen.html
Steady the heart by not picking up the signs of crisis or anxiety. Instead use the simple and steady body rhythms and signs that hold the heart. Make the heart the priority.
In the sensory world, boundaries, signs of separation and comparisons must be experienced. But entering the heart realm, we can experience the boundlessness of the brahma vihara.
In meditation we open an energy domain with discernable material and immaterial aspects. We meet, widen and soften to this experience, providing a pragmatic healing and protection against life's vicissitudes.
00:00 Can you speak more about compassion / karuna?; 05:06 How does equanimity support compassion?; 15:32 Is there such a thing as displaced compassion?; 22:26 Please say more about walking meditation and the breath; 23:36 Please speak more about the internal process of sila and dana; 39:40 What is the role of kamma in the interplay of right view and right intention? 48:34 Are nimittas important?
As a metaphor, a circle provides a necessary sense of coherence and boundary where you can enter and establish an abiding place for practice in all body postures.