Below is from WisdomQuotes.com:

You can only protect your liberties in this world by protecting the other man’s freedom. You can only be free if I am free. – Clarence Darrow 

It is the spirit and not the form of law that keeps justice alive. – Earl Warren

Injustice anywhere is a threat to justice everywhere. We are caught in an inescapable network of mutuality, tied in a single garment of destiny. Whatever affects one directly, affects all indirectly. – Martin Luther King, Jr.

This is the duty of our generation as we enter the twenty-first century — solidarity with the weak, the persecuted, the lonely, the sick, and those in despair. It is expressed by the desire to give a noble and humanizing meaning to a community in which all members will define themselves not by their own identity but by that of others. – Elie Wiesel (PRON.: EH-lee VEE-zell) 

The right way is not always the popular and easy way. Standing for right when it is unpopular is a true test of moral character. – Margaret Chase Smith

The challenge of social justice is to evoke a sense of community that we need to make our nation a better place, just as we make it a safer place. – Marian Wright Edelman