When something touches the tongue, the form aggregate (rūpakkhandha) changes and breaks down - this is matter.
When there's change, isn't there feeling? Experiencing good and bad - is this feeling (vedanā) human, deva, or brahma? This is the work of feeling.
Perceiving something as good or bad - is this human perception (saññā) or deva perception? This is the function of perception.
Mental formations (saṅkhārakkhandha) drive the process of change, stimulate feeling, and encourage perception. Is this volition (cetanā) a self? This is the work of volition.
Consciousness (viññāṇakkhandha) knows the changing, knows the feeling, knows the perceiving, knows the driving force.
Each has its own place and function.
Are they truly selves or persons?
#This_is_why_we_need_to_understand_the_aggregates