The refrain in the teaching on the Four Foundations of Mindfulness refers to contemplating internally, externally, and internally and externally.    Jon and Doug talk about how they receive that part of the teaching, which doesn't appear in any obvious way in other suttas but is actually a very important part of mindfulness. Support the Show.Go to our website to leave a comment, buy us a coffee, or see further notes and links: https://digginthedharma.com/