more:
"What is the meaning of human life, or, for that matter, of the life of any creature? To know an answer to this question means to be religious. You ask: Does it make any sense, then, to pose this question? I answer: The man who regards his own life and that of his fellow creatures as meaningless is not merely unhappy but hardly fit for life." - Mein Weltbild, Amsterdam: Querido Verlag, 1934.

"So I am living without fats, without meat, without fish, but am feeling quite well this way. It always seems to me that man was not born to be a carnivore."

but he also said:

"I have always eaten animal flesh with a somewhat guilty conscience."