“In joined hands there is still some token of hope, in the clinched fist none.”

Source: The Namesake

Attributed
Variant: You cannot shake hands with a clenched fist.

Attributed

Herbert N. Casson cited in: The International Chemical Worker Vol. 13-15 (1953). p. 192
1950s and later

1980s, A Dream Deferred (1989)
Context: He knew in 1968 that while this was a beautiful symbol of hope and possibility, it indeed was only the beginning. For after they joined hands what then were they going to do? Yes, he was dreaming again of marching on Washington, but this time the intent was to stay there not just for a day, not just for speeches and singing but to engage in a campaign of massive civil disobedience to try and stop, nonviolently, the functioning of the national government until the cause of the poor became this nation’s first priority—until all people were guaranteed a decent job, at a decent income, until we stopped the killing of Asians abroad in the Vietnam war and turned to attend to the very desperate needs of our people within our shores. That was the last dream. And if you understand that dream, if you understand that for the last six months of his life Martin Luther King Jr. was not only talking about but actively organizing native Americans, Hispanics, poor whites, blacks, people from all across this nation who had for so long been denied; if you realize how threatening that was, perhaps you will understand why the bullet came, perhaps where it came from.

Source: The Chronicles of Prydain (1964–1968), Book II: The Black Cauldron (1965), Chapter 2

Source: The Jagged Orbit (1969), Chapter 51, “If Your Number Comes Up Then Your Number Comes Up and That’s All There Is to It So What’s the Use of Worrying That’s What I Always Say” (p. 163)