Mark Twain (November 30, 1835 – April 21, 1910), real name Samuel Langhorne Clemens, was an American writer, humorist, entrepreneur, publisher, and lecturer. Among his novels are The Adventures of Tom Sawyer (1875) and its sequel, the Adventures of Huckleberry Finn (1885), the latter often called "The Great American Novel".
You may find more from Mark Twain on Wikiquote
This is what the world honors: wealth, eminence, long life, a good name. This is what the world finds happiness in: a life of ease, rich food, fine clothes, beautiful sights, sweet sounds. People who can't get these things fret a great deal and are afraid, wear themselves out rushing around on business, spend night and day scheming and scrutinizing. Man lives his life in company with worry, and if he lives a long time, then he has spent that much time worrying. This is a callous way to treat the body.