Investigation as Way to Suprahuman Force!
The Blessed Buddha once said:
When a Bhikkhu develops the Ways to Force, that is enriched with
concentrated Investigation,
constructed by effort, by
thinking: In this
way will my Investigation, neither
be too
slack, nor
too tense, it will
neither
be constricted internally,
nor scattered externally, then he
dwells
experiencing both what is in front, and what is behind, what is above, so
also below, so by day,
so also by night! Therefore, with a mind all
open, and unrestricted, he
develops the dazzling bright
mind, which is
pervaded by its own internal luminosity...
What is Investigation, that is too slack?
Investigation joined with
sloppy carelessness is
called investigation, that is too slack!
What is Investigation, that is too tense? Restless,
hurried, agitated investigation is
called
an investigation, that is too tense!
What is Investigation, that is constricted internally?
Investigation
done in laziness.
This is investigation that is constricted
internally!
What is Investigation, that is scattered externally?
Investigation
that in craving and urge is
directed towards the five sense
pleasures. This is called investigation that is scattered and
diverted externally!
How does one dwell experiencing both the front
and what is behind?
The perception of
both the front and the back side of all phenomena, is well attended to,
and
thereby well comprehended, well considered, and well known by understanding...
This is investigation, that knows both what is in
the front and back!
How does one dwell seeing as below, so above; as above, so below?
One reviews this very frame of body upwards from the soles of the
feet, and downwards from
the tips of the hairs, enclosed by skin, as full of many kinds of impurities: There are in this body:
Head-hairs, body-hairs, nails, teeth, skin, flesh, sinews, bones, bone-marrow,
kidneys, heart, liver,
pleura, spleen, lungs, intestines, mesentery, vomit in the stomach, excrement, bile, lymph, pus, blood,
sweat, fat, tears, slime, spit, snot, joint fluid , and urine...This is
investigation, that knows what is
below, so
also above; as above, so also below...
How does one dwell as by day, so at night; as at night, so by day?
Here, at night a Bhikkhu trains these
4 Steps to Force that is enriched with
concentrated investigation,
constructed by effort, using
the same
techniques, qualities, and aspects, as he trains during the day.
So does one abide
as by day, so at night; as by
night, so by day!
And how, does one dwell with a mind that is all open
and unrestricted, a dazzling bright mind, which is
pervaded by its own luminosity...?
Here, friends, the perception of day-light is well attended
to and well resolved upon by determination.
It is in exactly this way, that one dwells with a mind, that is all open
and unrestricted, a dazzling bright
mind, which is pervaded by its own luminosity...

Curious Investigation=inquiry=scrutiny=analysis
More
on the 4 Feet of Suprahuman Force!
https://What-Buddha-Said.net/library/DPPN/wtb/g_m/iddhi_paada.htm
https://What-Buddha-Said.net/drops/IV/Suprahuman_Force_I.htm
https://What-Buddha-Said.net/drops/IV/Suprahuman_Force_II.htm
https://What-Buddha-Said.net/drops/IV/Suprahuman_Force_III.htm
https://What-Buddha-Said.net/drops/IV/Suprahuman_Force_IV.htm
https://What-Buddha-Said.net/drops/IV/Suprahuman_Force_V.htm
https://What-Buddha-Said.net/drops/IV/Desire_as_Way_to_Force.htm
https://What-Buddha-Said.net/drops/IV/Energy_as_Way_to_Force.htm
https://What-Buddha-Said.net/drops/IV/Thinking_as_Way_to_Force.htm
https://What-Buddha-Said.net/drops/IV/Investigation_as_Way_to_Force.htm
Source (edited extract):
The Grouped Sayings of the Buddha.
Samyutta Nikāya. [V:278]
section 51: The 4 Forces: Thread 20: Analysis of the Ways.