I think the title speaks for itself.

“The point in history at which we stand is full of promise and danger. The world will either move forward toward unity and widely shared prosperity – or it will move apart.” ~ Franklin D. Roosevelt

“Talent perceives differences; genius, unity.” ~ William Butler Yeats

“We are each other’s harvest; we are each other’s business; we are each other’s magnitude and bond.” ~ Gwendolyn Brooks

“Like a sculptor, if necessary,carve a friend out of stone. Realize that your inner sight is blind and try to see a treasure in everyone.” ~ Jalaluddin Rumi

“When there is no enemy within, the enemies outside cannot hurt you.” ~ Winston Churchill

“For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.” ~ Rudyard Kipling

“We must all hang together, or assuredly we shall all hang separately.” ~ Benjamin Franklin

And, my personal favorite:

“All for one, and one for all.” ~ Alexandre Dumas