Change does not roll in on the wheels of inevitability, but comes through continuous struggle. And so we must straighten our backs and work for our freedom. A man can't ride you unless your back is bent. Martin Luther King, Jr.
The rich will do anything for the poor but get off their backs. Karl Marx
If you see a defense team with dirt and mud on their backs they've had a bad day. John Madden
True humility is expressed in deeds, not words. The humble are those who truly walk the same ground as everyone else - not necessarily with grovelling, hunched backs, but certainly not lording it over others, either. Julian Baggini
Retain the vision for space exploration. If we turn our backs on the vision again, we're going to have to live in a secondary position in human space flight for the rest of the century. Buzz Aldrin