Once after giving a lecture on friendship I was told I was undermining the hearers ability to have relationships with diverse people. Clarity on this issue is crucial. What had I asserted in my lecture? Aristotle’s principle: deep friendship requires unity of worldview. The longer I live the more I discover just how true this principle is, even if also at times heartbreaking. It is not simply characteristic of our ‘liberal’ age to seek relationships across lines of deeply held differences…