This Sutta (MN18) is mainly about mental proliferation which is one of the most important targets to subdue in Zen meditation and in meditation in general.
I have read the sutta from Bhikkhu Bodhi's translation and from Thanissaro Bhikkhu old translation. From both it is important to note that quarrels and disputes come from a blemished and undisciplined mind; this kind of mind elaborates around feelings and perceptions. This elaboration is called papañca. Thanissaro Bhikkhu, in his Introductory analysis of the sutta tells us that there is no clear definition of the term but a skilled meditator knows well what papañca is. It simply consists -not getting into a profuse elaboration- in the endless fabrication that mind produces when it meets something like an object, an idea, an odour, a surface, a noise or flavour.
It is not only about quarrels and disputes but in general all the happenings in our daily life. It is important to note that mental proliferation besets us as long as something is found there in the mind. The Buddha teaches that if nothing is found thereBut who is that that 'founds there'? It's perception; when one perceives one thinks about and this thinking about becomes immediately mental proliferation and with this fabrications one'to delight in, welcome and hold to, this is the end of the underlying tendndency to aversion, the underlying tendency to views, of the underlying tendency to doubt, of the underlying tendency to conceit, of the underlying tendency to desire of being, of the underlying tendency to ignorance...' and the end of restoring to rods and weapons...'This can be understood when we have in mind the causal chain of contact, feeling, perception and fabrication that applies to the eye, its object and the consciousness that becomes with its contact, the nose, the tongue, the body and finally the mind.'delights in, welcome and holds to...'
So, we can tell that an unblemished mind is the one which has cooled the senses and then, as the Buddha teaches in his discourseAny thoughts about the Sutta? Are we aware of mental proliferation during your day to day life? Do we proliferate endlessly about life, God, rebirth, past and future, etc...?'there is no eye, no form and no eye consciousness, it is impossible to point out the manifestation of contact. When there is no manifestation of contact it is impossible to point out the manifestation of feeling. When there is no manifestation of feeling it is impossible to point out the manifestation of perception. When there is no manifestation or perception it is impossible to point out the manifestation of thinking. When there is no manifestation of thinking it is impossible to point out the manifestation of besetment of perception and notions born of mental proliferation'.
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