NOTE: The English term ‘enlightenment’ is a metaphor representing a psycho-physical function not described. Enlightenment appears to be included in the experience of samma-sambodhi or samyak-sambodhi described by the Sakya Buddha.
En-lightenment happens if and when energy (hence life support capacity) increases (for instance when power is increased in a bulb and it gets brighter).
En-darkenment happens if and when energy (hence life support capacity) decreases (i.e. when the power to a bulb is decreased).
Light (i.e. as brightness or as the experience of physical or mental lightness or increase in speed) represents a relative increase in energy (or capacity).
Darkness (i.e. as dullness, or as the experience of an increase in physical or mental heaviness or slowness) represents a relative diminution or loss of energy (or capacity).
Light (i.e. energy up, indicating increased survival response capacity) and dark (energy down, indicating decreased survival response capacity) operate as basic Guide & Control mechanism in all biological systems.
An increase in light (or energy), hence enlightenment, tells a system: ‘You are doing fine. CONTINUE!’
A decrease in light (or energy, hence an increase in darkness) tells a system ‘You are doing badly. DISCONTINUE! Try something else’.
A surge of energy, experienced (i.e. transformed as high-level language representation) as enlightenment, is transformed further by the human as (energy) elation, i.e. as an (energy) high. The transformation compresses and morphs the biological information to a user friendly icon, thus making response easier, quicker and above all, more compelling.
A loss of energy capacity, hence endarkenment, is self-represented by the human as depression, i.e. as an energy low, further transformed as sorrow, suffering anguish and so on.
Energy (that is to say, life support capacity) is released internally by compressing out (i.e. by fissioning) redundant (i.e. formerly useful) or obstructing data and functions (i.e. unresolved problems and useless operations) and which need, and therefore suck energy to continue to operate. Energy is acquired externally by means of contact (i.e. by fusion). Energy is lost (i.e. depressed or depleted) by investing it in redundant or obstructive data and functions (i.e. unresolved problems), by supporting everyday life functions and by not acquiring added energy from external contact.
In simple terms, enlightenment (read also: increased arousal = awakening, Buddhism: bodhi) happens if and when an energy surge is generated within. This happens if and when an energy depleting operation, for instance an unresolved problem, is eliminated. The response to elimination of energy depletion is an energy back-flow or rush that restores the human system to increased of not, as in the case of the Sakya Buddha, to full power. This happened to him because he became fully aroused (or awakened) because he had resolved his problem to perfection, and nothing remained.
Endarkenment, that is to say, decrease of arousal or awakening, i.e. returning to sleep, happens if and when an energy loss is generated within (or from without), and which reduces an individual’s capacity to respond @ best to the world. An energy loss is displayed on the human’s internal states monitoring system (i.e. consciousness) as unhappiness; or sorrow, anguish, suffering and so on.
In short, the Sakya Buddha achieved samma-sambodhi when he resolved his all consuming problem fully. For this he self-rewarded with a tremendous rush of energy + the feeling of freedom + the sense of perfect completion (i.e. of perfection) so that ‘nothing further needed to be done.’