Textual references make clear that sections, at least, of “Letters from the Earth” were written shortly before his death in April 1910. (For instance, Letter VII, in discussing the ravages of hookworm, refers to the $1,000,000 gift of John D. Rockefeller Jr. to help eradicate the disease – a gift that was announced on October 28, 1909, less than six months before Twain's death.)"
by Mark Twain
"This is a strange place, an extraordinary place, and interesting. There is nothing resembling it at home. The people are all insane, the other animals are all insane, the earth is insane, Nature itself is insane. Man is a marvelous curiosity. When he is at his very very best he is a sort of low grade nickel-plated angel; at his worst he is unspeakable, unimaginable; and first and last and all the time he is a sarcasm. Yet he blandly and in all sincerity calls himself the "noblest work of God." This is the truth I am telling you. And this is not a new idea with him, he has talked it through all the ages, and believed it. Believed it, and found nobody among all his race to laugh at it.
Moreover - if I may put another strain upon you - he thinks he is the Creator's pet. He believes the Creator is proud of him; he even believes the Creator loves him; has a passion for him; sits up nights to admire him; yes, and watch over him and keep him out of trouble. He prays to Him, and thinks He listens. Isn't it a quaint idea? Fills his prayers with crude and bald and florid flatteries of Him, and thinks He sits and purrs over these extravagancies and enjoys them. He prays for help, and favor, and protection, every day; and does it with hopefulness and confidence, too, although no prayer of his has ever been answered. The daily affront, the daily defeat, do not discourage him, he goes on praying just the same. There is something almost fine about this perseverance. I must put one more strain upon you: he thinks he is going to heaven!"