Friends:

Thinking as Way to Suprahuman Force:

The Blessed Buddha once said:
When a Bhikkhu develops the Ways to Force that is enriched with
concentrated Thinking, constructed by effort, by thinking: In this
way will Thinking, 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 & what is behind, what is above,
so also below, so by day, so also at night! Therefore, with a mind all
open & unrestricted, he develops the dazzling bright mind, which is
pervaded by its own internal luminosity... However:
What is Thinking that is too slack? Thinking joined with dullness is
called Thinking that is too slack!
What is Thinking that is too tense? Restless & agitated Thinking is
called Thinking that is too tense
What is Thinking that is constricted internally? Thinking done with
lethargy & laziness. This is Thinking that is constricted internally!
What is Thinking that is scattered externally? It is Thinking that is
distracted & diverted externally urging for the 5 sense pleasures...
This is called Thinking that is scattered & distracted externally!
How does one dwell experiencing both the front & what is behind?
The perception of front, back, is well attended to, & thereby well
comprehended, well considered, & penetrated by understanding...
This is called Thinking that knows both what is in the front & 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, & 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 called Thinking that is below, so above; as above, so below...
How does one dwell as by day, so at night; as at night, so by day?
Here, at night a Bhikkhu trains the Ways to Force that is enriched
with concentrated Thinking, constructed by effort using the same
techniques, qualities, features, & aspects, as he trains during a day.
And how, does one dwell with a mind that is all open & unrestricted, 
a dazzling bright mind, which is pervaded by its own luminosity...?
Here, friends, the perception of day-light is well attended and well
resolved upon by determination. It is in exactly this way that one
dwell with a mind that is all open & unrestricted, a dazzling bright
mind, which is pervaded by its own luminosity...

More on the 4 Feet of Suprahuman Force!
http://What-Buddha-Said.net/library/DPPN/wtb/g_m/iddhi_paada.htm
http://What-Buddha-Said.net/drops/IV/Suprahuman_Force_I.htm
http://What-Buddha-Said.net/drops/IV/Suprahuman_Force_II.htm
http://What-Buddha-Said.net/drops/IV/Suprahuman_Force_III.htm
http://What-Buddha-Said.net/drops/IV/Suprahuman_Force_IV.htm
http://What-Buddha-Said.net/drops/IV/Suprahuman_Force_V.htm
http://What-Buddha-Said.net/drops/IV/Desire_as_Way_to_Force.htm
http://What-Buddha-Said.net/drops/IV/Energy_as_Way_to_Force.htm
http://What-Buddha-Said.net/drops/IV/Thinking_as_Way_to_Force.htm
http://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.

Thinking as a Way to Force!