More quotes by Mark Twain

"Nothing exists but you. And you are but a thought."
"I must have a prodigious amount of mind; it takes me as much as a week, sometimes, to make it up!"
"Education: that which reveals to the wise, and conceals from the stupid, the vast limits of their knowledge."
"I've lived through some terrible things in my life, some of which actually happened."
"The secret source of humor is not joy but sorrow; there is no humor in Heaven."