Unity

FDtD p. 466

"...if one asks why in the face of such divisions, one speaks of unity at all, the answer for all periods is that the ultimate unifying force of an age is its predicaments: the urgent demands, the obstacles to social peace or progress, the need for new art that Stendhal pointed out--things that alert minds cannot ignore: every living thinker or artist works to fulfil these calls or deny them in some way."

Perhaps the best sentence I've ever read with two colons, not to mention a --.