Greatest spiritual master

Who is the greatest spiritual master of the 20th century?  One person who knew him, says Thomas Merton. If this same person says Dorothy Day places 2nd, and I disagree, does this not taint his1st place rating too?  Just asking. One thing for sure - I did not know insanity could be so amusing until I put in 2 hrs with the 7 Democrat candidates for President last night. They screamed, shouted, complained and dissed America, the rich and corporations -  all agreeing Trump must be replaced because he's "dangerous."  Laughable (and scary at the same time). 

Almost every other word in the debate of rants was "systemic." The biggest fraud ( hypocrite) Elizabeth Warren, wants 1. conscious race laws, 2. an end to the hedge fund loophole (every American knows that this treats carried interest as capital gain instead of ordinary income, right?) and 3. the government to pay for opioid crisis treatment.  Did I say that insanity could not be more laughable (and scary)?