It ain’t those parts of the Bible that I can’t understand that bother me, it is the parts that I do understand.

Mark Twain (1835-1910) American writer [pseud. of Samuel Clemens]

(Spurious)

Widely attributed to Twain, but not found in any of his printed works. The first attribution appeared in 1915, after Twain's death.

For more discussion, see Quote Origin: Some People Are Troubled by the Things in the Bible They Can’t Understand. The Things That Trouble Me Are the Things I Can Understand – Quote Investigator®.