The Walls of Ignorance, by Thanissaro Bhikkhu

Meditations 2: Dhamma Talks

The daily schedule at Metta Forest Monastery includes a group interview in the late afternoon, and a chanting session followed by a group meditation period later in the evening. The Dhamma talks included in this volume were given during the evening meditation sessions, and in many cases covered issues raised at the interviews - either in the questions asked or lurking behind the questions.

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I've just read this one this morning. It was very poignant when I needed it.