Upvote:1
The explanation for Kusala
can be found in MN-3 -> Maha Chattarika Sutta
( I can't find this in english translation site, but this is in Sinhala / Pali Thripitaka ), So if I explain it how I understood by reading it,
It's about noble eightfold path, and in each it's describe two things one is lokottara (= focusing on Nivana) path
the other one is laukika (= focusing on good things in this world: eg -> samma kammanta = to do a decent job, not kill animals and sell
).
And the opposite of this is Akusala
which doing opposite things not knowing what the right
view, resolve, speech, etc..
About lokottara path
that person should have a correct view what is the problem with the world, why we are attached to things, and why we should not attached, what's the danger in that so on.
Hope my description led some lights and I should accept that I'm not a good translator.
Update:
Found more information on this. It's in Vibhangaprakaranaya-1, paticcasamuppada vibhangaya
There you can notice what is kusala dharmayo
, the explanation is given the paticcasamuppada cycle but it starts with sankara
not with avijja
that means when a thought is processed without avijja
it causes to Nivana as it is a kusala