There are two nusachos with the fourth brocha in Shemoneh Esreh of which I am aware. One, extant today in nusach Ashkenaz, certain nusach Sefard, and Teman Baladi, and present in very old siddurim, ends "deah, binah, v'haskel". Why are these three words linked conceptually?
Strictly by way of comparison, other nusachos have "chochmah, binah, vadaas", which have a clear source in that they are three linked sefiros.
