Thus spoke the Blessed One, and the Group of Five bhikkhus were gladdened. Now while this discourse was being delivered, the untarnished and clear insight arose in Venerable Kondanna thus: “Whatever has the nature to arise, has the nature to cease.”

During this talk, there arose in Kondanna the clear seeing of the Dhamma “that whatever has the nature to arise, has the nature to cease.” He insightfully saw the holding onto the world wherein dukkha [suffering] is conditioned and is let go of. In order to recognize that everything – even the very thoughts and emotions that one has – just comes and goes means that there is dispassion and detachment, a clear seeing of how things work.

Attachment means that we give thoughts or feelings a significance that they would not have if they were seen as passing phenomena. With attachment there is no independence from the immediate circumstances, no space to see things objectively. So we go up with the ups and down with the downs, falling into despair about being depressed, and we then languish in that mood.

Ajahn Sucitto, The Dawn of the Dhamma: Illuminations from the Buddha’s First Discourse