May all that have life be delivered from suffering.
~ Gautama Buddha

It is just like man’s vanity and impertinence to call an animal dumb because it is dumb to his dull perceptions.
~ Mark Twain

Man is the only animal for whom his own existence is a problem which he has to solve.
~ Erich Fromm

I have from an early age abjured the use of meat, and the time will come when men such as I will look upon the murder of animals as they now look upon the murder of men.
~ Leonardo da Vinci

The assumption that animals are without rights, and the illusion that our treatment of them has no moral significance, is a positively outrageous example of Western crudity and barbarity. Universal compassion is the only guarantee of morality.
~ Arthur Schopenhauer, The Basis of Morality