STRIVE: toil try fight struggle quarrel contend

STRIFE: fight battle conflict quarrel dispute

I wondered if these words were related, yes, in fact from the same root — in middle europe listed at somewhere around 1200.  It is interesting how the word strive has a positive spin, and the word strife has a negative spin.  BOTH could mean conflict, perhaps the former is internal conflict and the latter is external conflict.  just thinking out loud.