What some notable vegetarians had to say on the subject of vegetarianism, in chronological order
"Let the advocate of animal food force himself to a decisive experiment on its fitness, and as Plutarch recommends, tear a living lamb with his teeth and, plunging his head into its vitals, slake his thirst with the steaming blood ... then, and then only, would he be consistent."
"In all the round world of Utopia there is no meat. There used to be. But now we cannot stand the thought of slaughterhouses. And, in a population that is all educated, and at about the same level of physical refinement, it is practically impossible to find anyone who will hew a dead ox or pig ... I can still remember as a boy the rejoicings over the closing of the last slaughterhouse."
Adolf Hitler was NOT a vegetarian. Those who are opposed to vegetarianism often, incorrectly, state that Adolf Hitler was a vegetarian - thus implying that vegetarianism is somehow related to murderous authoritarianism. In Robert Payne's biography of Hitler he writes, "Hitler's asceticism played an important part in the image he projected over Germany. According to the widely believed legend, he neither smoked nor drank, nor did he eat meat or have anything to do with women. Only the first was true. He drank beer and diluted wine frequently, had a special fondness for Bavarian sausages..." The Bavarian sausages that Hitler ate were made from the flesh of animals, and are certainly not consistent with a vegetarian diet.
The following Christians practice or practiced vegetarianism believing it to be spiritually beneficial: