Lots of good quotes out there. Many of them are difficult to originally attribute to any one person definitively, but here are a few good ones to keep in mind in these times:
"There are three kinds of lies: Lies, damned lies, and statistics."
"It's better to be thought a fool and remain silent than to open one's mouth and remove all doubt."
"It's easier to fool someone than it is to convince them that they've been fooled."
"When fascism comes to America, it will be wrapped in a flag and carrying a cross."
"A riot is the language of the unheard." - MLK Jr
"Judge not, lest ye be judged." - Matthew 7:1
"If you can convince the lowest white man he's better than the best colored man, he won't notice you're picking his pocket. Hell, give him somebody to look down on, and he'll empty his pockets for you." - LBJ
"An injustice anywhere is a threat to justice everywhere." MLK Jr
"A flatterer is not a good companion for any man; and the public man who rises only by flattering his constituents is just as unsafe a companion for them." - Teddy Roosevelt
"Only when the last tree has been cut, that fish caught, and the last stream poisoned, will we realize that we cannot eat money." - Cree proverb
"A society grows great when old men plant trees in whose shade they will never sit." - Greek proverb
"Thank your lucky stars you've got protection/Walk the line and never mind the cost/Don't wonder who them lawmen were protecting/When they nailed the savior to the cross" - Kris Kristofferson