There are a number of themes that are very familiar to people who practise Buddhist meditation: ‘mindfulness of breathing’, where you focus on the rhythm of the breath; ‘walking meditation’, that revolves around the feeling of the footsteps as you walk up and down a path; the internal repetition of a mantra, such as ‘Bud-dho’ – these are all designed to help ground the attention in the presence of this very moment, this present reality.
Along with these more well-known methods there are many others that can serve a similar function. One of these is known as ‘inner listening’ or ‘meditation on the inner sound’ or, in Sanskrit, ‘nada yoga’. These terms all refer to attending to what has been called ‘the sound of silence’, or ‘the nada-sound’. ‘Nada’ is the Sanskrit word for ‘sound’ as well as being the Spanish word for ‘nothing’ – an interesting and accidentally meaningful coincidence.
Excerpt From: Ajahn Amaro. “Inner Listening.”