Reverence means not simply a way of behaving at Mass, but an attitude toward other people. The opposite of reverence is arrogance and a refusal to greet with awe those persons and things that are higher than oneself.
Just so you know, I’ll be taking some time to review this book in the days ahead. I figured looking at good liturgy was the best way to celebrate Summorum Pontificum. (If that really is the title.)