"It is essential to understand this point thoroughly: that the thing-in-itself, whether animal, vegetable, or mineral, is not only unknowable-it does not exist. This is important not only for sanity and peace of mind, but also for the most "practical" reasons of economics, politics, and technology.. This is not to say only that things exist in relation to one another, but that what we call "things" are no more than glimpses of a unified process. Certainly, this process has distinct features which catch our attention, but we must remember that distinction is not separation."
The indifference, callousness and contempt that so many people exhibit toward animals is evil first because it results in great suffering in animals, and second because it results in an incalculably great impoverishment of the human spirit.
Consider the cattle, grazing as they pass you by. They do not know what is meant by yesterday or today, they leap about, eat, rest, digest, leap about again, and so from morn till night and from day to day, fettered to the moment and its pleasure or displeasure, and thus neither melancholy nor bored. [...] A human being may well ask an animal: 'Why do you not speak to me of your happiness but only stand and gaze at me?' The animal would like to answer, and say, 'The reason is I always forget what I was going to say' - but then he forgot this answer too, and stayed silent.
Personal courage is really a very subordinate virtue-a virtue, indeed, in which we are surpassed by the lower animals; or else you would not hear people say, as brave as a lion.
Indecency, vulgarity, obscenity - these are strictly confined to man; he invented them. Among the higher animals there is no trace of them. They hide nothing. They are not ashamed.
One cannot bring children into a world like this. One cannot perpetuate suffering, or increase the breed of these lustful animals, who have no lasting emotions, but only whims and vanities, eddying them now this way, now that.
I confess that my stomach does not take to this style of cooking. I cannot accept calves sweetbreads swimming in a salty sauce, nor can I eat mince consisting of turkey, hare, and rabbit, which they try to persuade me comes from a single animal... As for the cooks, I really cannot be expected to put up with this ham essence, nor the excessive quantity of morels and other mushrooms, pepper, and nutmeg with which they disguise perfectly good food.
All the human and animal manure which the world wastes, if returned to the land, instead of being thrown into the sea, would suffice to nourish the world.