Arthur Schopenhauer, Ph.D., German Philosopher, Atheist
The wise man will, above all, strive after freedom from pain and annoyance, quiet and leisure, consequently a tranquil, modest life, with as few encounters as may be; and so, after a little experience of his so-called fellow-men, he will elect to live in retirement, or even, if he is a man of great intellect, in solitude. For the more a man has in himself, the less he will want from other people—the less, indeed, other people can be to him. This is why a high degree of intellect tends to make a man unsocial.
