Grammy-winning singer-songwriter John Legend delivered a stirring commencement address on Sunday at the University of Pennsylvania, College of Arts and Science.

In his speech, Legend powerfully expressed his own journey from a belief in simple black and white dichotomies to a more tolerant view of humanity:

That comforting dichotomy of right and wrong was replaced by what professors here would call inquiry, methodology, and praxis.

Or in layperson's terms, a never-ending series of questions,...