There were so many piercing observations in Now and Then: A Memoir of Vocation, you need to read it for yourself. For now, here’s the sentence that most accurately describes his observational outlook:

There is no event so commonplace but that God is present within it, always hiddenly, always leaving you room to recognize him or not to recognize him, but all the more fascinatingly because of that, all the more compellingly and hauntingly.