The simple things are the ones most needed today if we are to surmount what divides us, and cement what unites us. To lower our voices would be a simple thing. In these difficulty years, America has suffered from a fever of words: from inflated rhetoric that promises more than it can deliver; from angry rhetoric that fans discontents into hatreds; from bombastic rhetoric that postures instead of persuading. . . . We cannot learn from one another until we stop shouting at one another.
No cheating. I'm sure you could Google it quite easily.
Who do you think said it, and when? Not a contest: I'll put the answer in the first comment.