Since Lewis Regenstein has no qualms about referencing the New Testament, if really wants to get a grip on reality he should ponder the meaning of the term "the stone which the builders rejected." And then meditate on the parable of the master who sent his servant out to gather travelers and beggars from the countryside for a feast, after all the master's friends turned down his invitation.
There were a number of parables on that subject. Matthew 21:33 comes to mind