The Equanimity link to Awakening:

Even evaluation
is a characteristic of this equanimity (Upekkhā-Sambojjhanga).
Preventing both
any deficiency,
and any excess, thereby securing
unbiased
impartiality
is the function of
equanimity. Imperturbable
ballance
is the serene, equipoised, and
placid manifestation
of the equanimity link to awakening. Equanimity
just looks on
in calm,
whenever new
captivating phenomena arise and cease. This stable,
yet plastic patience
purifies all the other
advantageous
mental states, which reach a completed maximum,
when joined with
this imperturbable Equanimity...

Equanimity
(Upekkhā) is then main moderating mental
construction.
Equanimity is also a mood
of neither gladness, nor sadness.
Equanimity is also a feeling of neither
pain, nor pleasure.
Equanimity is also the neutral ability to be
indifferent.
Equanimity is also the 4th infinitely
divine
dwelling.
Equanimity is also a quite subtle form of
happiness.
Equanimity is also a refined mental
purification.
Equanimity is therefore a
Link to Enlightenment...
There is Equanimity both regarding all mental states, and
all physical things.
There is Equanimity both
regarding all internal, and external phenomena.
There is
Equanimity both regarding all past, present, and future
events.
There is
Equanimity both regarding pain, pleasure, and neutral feeling.
There is Equanimity both regarding joy, grief, and indifferent mood.
There is Equanimity both regarding all mentality, and all materiality.
There is Equanimity
both regarding all alive beings, and dead things.

The Buddha once said:
What
mental
fermentations (āsava) should be
overcome by development?
If a Bhikkhu by alert and
rational attention
develops the equanimity link
to awakening
while dwelling in seclusion,
disillusion, and ceasing, this will
culminate in full renouncing relinquishment.. Then neither can any mental
fermentation, nor can any fever of discontent
ever arise in him. MN2 [i 11]

When concentrated one
can observe all from an as if above aloof equanimity.
The
equanimity link to
awakening arises right there. One develops
it, and for
anyone regularly meditating, equanimity gradually completes its evolution.
MN118 [iii 85]
Podcast on How to gain Equanimity,
Balance, Peace and Ease:
https://soundcloud.com/bhikkhu-samahita/serene-equanimity-upekkha

Further inspirations on the imperturbable
quality
of Equanimity
(Upekkhā):
Even is
Equanimity,
The 7
Links to Awakening,
Serene Equanimity and Beyond,
Imperturbable Equanimity,
Unshakable Equanimity,
Equanimity Upekkha,
Feeding
Equanimity,
Empty
Equanimity,
High_and_Alert,
What_is_Wrong,
Safe_Medicine,
Serene_Equanimity,
Divorced_Freedom,
Tatra-Majjhattat,
Exquisite_Equanimity.