On sankhara's I found this passage:
"And why, bhikkhus, do you call them volitional formations? (sankhara)
'They construct the conditioned,' bhikkhus, therefore they are called volitional formations. And what is the conditioned that they construct?
They construct conditioned form as form, they construct conditioned feeling
as feeling, they construct conditioned perception as perception, they construct
conditioned volitional formations as volitional formations, they construct
conditioned consciousness as consciousness. 'They construct the conditioned,'
bhikkhus, therefore they are called volitional formations."
[BB, TCDB, part of SN 22.79]
This is not easy to understand.
Also posted on Spiny's new 'sankhara aggregate' thread.