I've collected a few that I've found important to me.
Your Honor, years ago I recognized my kinship with all living beings, and I made up my mind then that I was not one bit better than the meanest on Earth. I said then, and I say now, that while there is a lower class, I am in it; and while there is a criminal element, I am of it; and while there is a soul in prison, I am not free. - Eugene V. Debs
Be ruthless with systems, and be kind to people. - Michael Brooks
A man who is so exceedingly civil that for the sake of quietude and a peaceable name will silently see the community imposed upon, or their rights invaded, may, in his principles, be a good man, but cannot be styled a useful one, neither does he come up to the full mark of his duty; for silence becomes a kind of crime when it operates as a cover or an encouragement to the guilty. - Thomas Paine