How are there Fourteen Links to Awakening?

The Blessed Buddha once said:
There is awareness of all internal states, & awareness of all external states.
Both kinds of awareness are leading to Enlightenment (sati-sambojjhanga).
There is investigation of both all internal states, and of all external states.
Both these investigations are links to Enlightenment (vicaya-sambojjhanga).
There is energy of body (strength), and energy of the mind (enthusiasm).
Both kinds of energy are leading to Enlightenment (viriya-sambojjhanga).
There is joy associated with thinking, and there is joy without any thinking.
Both kinds of joy are links leading to Enlightenment (pīti-sambojjhanga).
There is tranquillity of the body, and there is tranquillity of the mind.
Both these calms are links to Enlightenment (passaddhi-sambojjhanga).
There is concentration during thinking and concentration without thinking.
Both concentrations are links to Enlightenment (samādhi-sambojjhanga).
There is equanimity both regarding internal states and external states.
Both these kinds are links to Enlightenment (upekkhā-sambojjhanga).
This can only a Buddha, or a true disciple of a Buddha see, and explain...

Comments:
Awareness of all internal mental states is the most important, and highest.
Investigation of all internal mental states is the primary, and most fruitful.
Energy of the mind is the most advantageous, effective, and most enabling.
Joy without any thinking is the most rapturous, ecstatic, and all-pervading.
Tranquillity of the mind is the deepest, most calm, serene, and imperturbable.
Concentration without any thinking is the most one-pointed and absorbed.
Equanimity regarding internal mental states is the best guard and protection.

On the 7 Links to Awakening (Sambojjhanga):
http://What-Buddha-Said.net/drops/III/The_Sun.htm
http://What-Buddha-Said.net/drops/III/The_Peak.htm
http://What-Buddha-Said.net/drops/III/The_Clothes.htm
http://What-Buddha-Said.net/drops/III/Rare_Emergence.htm
http://What-Buddha-Said.net/drops/III/Sequential_Seven.htm
http://What-Buddha-Said.net/drops/III/Vast_Penetration.htm
http://What-Buddha-Said.net/drops/III/The_Seven_Fruits.htm
http://What-Buddha-Said.net/drops/III/Unsurpassable_Seven.htm
http://What-Buddha-Said.net/drops/The_7_Links_to_Awakening.htm
http://What-Buddha-Said.net/drops/III/Leading_to_Enlightenment.htm
http://What-Buddha-Said.net/drops/III/The_Seven_Links_to_Awakening.htm
http://What-Buddha-Said.net/drops/III/The_Cause_of_Knowledge_and_Vision.htm
http://What-Buddha-Said.net/drops/III/The_Meaning_of_the-7_Links_to_Awakening.htm

Sources (edited extracts):
The Grouped Sayings of the Buddha. Samyutta Nikāya.
Book [V: 111] 46: Links. 52: A way of Explaining...

When 7 becomes 14...

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