November 8, 2016 feels like it needs its own marker.

Unitarian minister Theodore Parker wrote in 1853:

I do not pretend to understand the moral universe, the arc is a long one, my eye reaches but little ways. I cannot calculate the curve and complete the figure by the experience of sight; I can divine it by conscience. But from what I see I am sure it bends towards justice.

http://quoteinvestigator.com/2012/11/15/arc-of-universe/

Martin Luther King Jr. more famously summarized Parker's thought as “the arc of the moral universe is long, but it bends toward justice.”

It is also worth rereading King's "I Have a Dream" in its entirety:
I Have a Dream