Where does “सत्त्व” come from?

सत्त्व (Sanskrit) comes from Sanskrit सत्, from Proto-Indo-Iranian *Hsáns.

सत्त्व (Sanskrit): essence; goodness; spirit

Definitions

Step	Language	Word	Meaning
1	Sanskrit	सत्	present participle of अस् ; being, existing,...
2	Proto-Indo-Iranian	*Hsáns	—

सत्त्व — Etymology, Origin & Word History | Etymology Explorer