„Anyone who tries to improve the lives of animals invariably comes in for criticism from those who believe such efforts are misplaced in a world of suffering humanity.“

— Jane Goodall

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„I believe in progress; I believe that happiness is the goal of humanity, and I cherish a higher idea of the Divine Being than those pious folk who suppose that man was created only to suffer.“
— Heinrich Heine
„There are two different types of people in the world, those who want to know, and those who want to believe.“
— Friedrich Nietzsche