"Gotama declares: 'I will show you the burden and the carrier of the burden, the burden's addition and the burden's relief.' He explains that the burden is the five bundles (aggregates), the carrier of the burden is the person of such a name and clan. What is added to the burden is reactivity/craving and the burden relief is the fading away and ceasing of that reactivity, that is, nirvana." 

After Buddhism: Rethinking the Dharma for a secular age