From this videoconference talk from 2 August, 2019, Ajahn Anan discusses the value of that which overflows from the mind, like the value of that which overflows from a teacup.

An excerpt: "Venerable Nan-in said, “For you as well, how can I put any more in to you? You are full of thoughts and views, following your own attachments and opinions. These two things will make you unable to understand Zen Buddhism. This is called 'the teacup that is overflowing'.”

Note: One can read this talk and others at the Wat Marp Jan 'Reflections' page, which also includes questions and answers with Ajahn Anan, which are not in the audio files. See: https://watmarpjan.org/en/dhamma-reflections/reflections-archive/