Mark Twain

"Travel is fatal to prejudice, bigotry, and narrow-mindedness and many of our people need it sorely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime." 

Hermann Hesse

"We kill at every step, not only in wars, riots, and executions. We kill when we close our eyes to poverty, suffering, and shame. In the same way all disrespect for life, all hard-heartedness, all indifference, all contempt is nothing else than killing. With just a little witty skepticism we can kill a good deal of the future in a young person."