According to the British Medical Journal, vegetarians are more intelligent

"A man of my spiritual intensity does not eat corpses."
-George Bernard Shaw

"For as long as men massacre animals, they will kill each other. Indeed, he who sows the seed of murder and pain cannot reap joy and love."
-Pythagoras  

"The time will come when men such as I will look upon the murder of animals as they now look on the murder of men."
-Leonardo da Vinci

"You have just dined, and however scrupulously the slaughterhouse is concealed in the graceful distance of miles, there is complicity."
-Ralph Waldo Emerson  

"As long as there are slaughterhouses, there will be battlefields."
-Leo Tolstoy

"The greatness of a nation and its moral progress can be judged by the way its animals are treated."
-Mahatma Gandhi

"Nothing will benefit human health and increase the chances for survival of life on earth as much as the evolution to a vegetarian diet."
-Albert Einstein

"Every man who has ever been earnest to preserve his higher or poetic faculties in the best condition, has been particularly inclined to abstain from animal food."
-Henry David Thoreau

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I found this article by accident but I thought it was interesting that science is starting to catch up with Eastern philosophy:

"Vegetarians are more intelligent: the British Medical Journal says"

In case you find that source to be biased, here's a BBC News article as well:

"High IQ link to being vegetarian."

"But Dr. Frankie Philips, of the British Dietetic Association, said:  'It is like the chicken and the egg.  Do people become vegetarian because they have a very high IQ or is it just that they tend to be more aware of health issues?' "