Whenever you see a form, let there be just the seeing. Whenever you hear a sound, let there be just the hearing. When you smell an odor, let there be just the smelling. When you taste a flavor, let there be just the tasting. When a thought arises, let it just be a natural phenomenon arising in the mind.
When you practice like this, there will be no self, no “I.” When there is no self, there will be no running that way and no coming this way and no stopping anywhere. Self does not exist. That is the end of suffering. That itself is nirvana.
—Buddha Shakyamuni, Bahiya Sutra, paraphrased by Buddhadasa Bhikkhu