Why Kammavipaka could not be think of?

[yamaka]

Dear all,

In the Anguttara Nikaya->Book of 4>77(Acinteyya Sutta)

Buddha stated there are 4 kinds of things could not be think of, which 4?

1.Buddha's attainment,
2.Jhanas
3.Action & result,
4.The world

I am more interested the kammavipaka(action and result) could not be analyzed or think of, more reading on the commentaries for the sutta:

Kammavipākoti diṭṭhadhammavedanīyādīnaṃ kammānaṃ vipāko.

Can anyone help to clarify more on this sentences?

[robertk]

now there is seeing (vipaka) and a visible object.
Do you know the kamma that caused this particular vipaka to arise at exactly this time?

Probably not as that is the domain on Buddhas.

[David N. Snyder]

Could be because it is speculative, inviting too much specualtion?

The translation appears to be:

"The [precise working out of the] results of kamma...

(from Thanissaro Bhikkhu, translation)

[yamaka]

Thanks all for the inputs.