“There's nothing wrong with having a tree as a friend.”

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book II, Chapter IX, Sec. 4

Part of the speech to the students of the Georgia Institute of Technology (Summer 2010)
Context: My goal is simple. All I want to do is re-connect people with animals. Awaken some emotions and some feelings and some logic, that is been buried and suppressed, intentionally, by our society. And the reason why I say re-connect it's because each and every person in this room used to be a real animal rights person at one time, a true animal lover, and a real friend to the animal kingdom. And it's when we were kids! When we were young... When we were kids! We used to be in awe of animals."They used to make us laugh, and giggle and smile. They made us pretty happy! And there was a time in our lives, when we would do just about anything in the world to make them happy as well. To protect them from cruelty! Or to, at least, acknowledge the cruelty they were receiving. I mean, if somebody was mean to an animal in front of us when we were little, we would have screamed and cried. And that's because we all used to understand right from wrong, when it came to the treatment of animals. Until somebody told us, and taught us differently. You better believe that somebody told us to ignore their suffering! To mock and excuse, their pain, and their misery. To make fun of their very existence. And this is something I want you to focus on - today, tomorrow and beyond... What in the hell happened along the way?! Who taught us to be so mean, and nasty and vicious and hateful, or indifferent towards animals when they used to be our friends? These are innocent beings, who have done nothing wrong to us.

Creating a World without Poverty: Social Business and the Future of Capitalism (2007)

Source: The Goose Girl

As quoted in The Lives and Opinions of Eminent Philosophers by Diogenes Laërtius, as translated by C. D. Yonge, (1853), "Anacharsis" sect. 5, p. 48

1850s, Speech at Peoria, Illinois (1854)
Context: The foregoing history may not be precisely accurate in every particular; but I am sure it is sufficiently so, for all the uses I shall attempt to make of it, and in it, we have before us, the chief material enabling us to correctly judge whether the repeal of the Missouri Compromise is right or wrong.
I think, and shall try to show, that it is wrong; wrong in its direct effect, letting slavery into Kansas and Nebraska — and wrong in its prospective principle, allowing it to spread to every other part of the wide world, where men can be found inclined to take it.
This declared indifference, but as I must think, covert real zeal for the spread of slavery, I can not but hate. I hate it because of the monstrous injustice of slavery itself. I hate it because it deprives our republican example of its just influence in the world — enables the enemies of free institutions, with plausibility, to taunt us as hypocrites — causes the real friends of freedom to doubt our sincerity, and especially because it forces so many really good men amongst ourselves into an open war with the very fundamental principles of civil liberty — criticising the Declaration of Independence, and insisting that there is no right principle of action but self-interest.

His self-made epitaph, as quoted in Heroes of History : A Brief History of Civilization from Ancient Times to the Dawn of the Modern Age (2001) by Will Durant; variant translation: "...nor enemy harmed me"

Source: Speak