"Child psychology and animal psychology are of relatively slight importance, as compared with the sciences which deal with the corresponding physiological problems of ontogeny and phylogeny"

"Anyone who hates children and animals can't be all bad"

"The fate of animals is of greater importance to me than the fear of appearing ridiculous; it is indissolubly connected with the fate of men"

"I want to be spontaneous like a wild animal"

"He who is cruel to animals becomes hard also in his dealings with men. We can judge the heart of a man by his treatment of animals"

"Man is by nature a political animal"

"Until one has loved an animal a part of one's soul remains unawakened"

"Man is the only animal that can remain on friendly terms with the victims he intends to eat until he eats them"

"The only meat I eat is from animals I've killed myself"

"Often and often afterwards, the beloved Aunt would ask me why I had never told anyone how I was being treated. Children tell little more than animals, for what comes to them they accept as eternally established"

"Certainly it is wrong to be cruel to animals and the destruction of a whole species can be a great evil. The capacity for feelings of pleasure and pain and for the form of life of which animals are capable clearly impose duties of compassion and humanity in their case"