Hi, all

I'm trying hard to find original sources for the following three Mark
Twain quotes.  If anyone knows where in his work these words originally
appeared, can you let me know?

"It ain't the parts of the Bible that I can't understand that bother 
me, it is the parts that I do understand."
-Mark Twain

"Sacred cows make the best hamburger."
-Mark Twain

"If there is a God, he is a malign thug."
-Mark Twain

Thank you!
Sara Bader