The First Step, 1892:

„I only wish to say that for a good life a certain order of good actions is indispensable; that if a man's aspirations toward right living be serious they will inevitably follow one definite sequence; and that in this sequence the first virtue a man will strive after will be self-control, self-restraint. And in seeking for self-control a man will inevitably follow one definite sequence, and it this sequence the first thing will be self-control of food. And if he be really and seriously seeking to live a good life, the first thing from which he will abstain will always be the use of animal food, because, to say nothing of the excitation of the passions caused by such food, its use is simply immoral, as it involves the performance of an act which is contrary to moral feeling -- killing; and is called forth only by greediness and the desire for tasty food."