You've always worked hard and done your best.

It ain't your fault." "I don't know whether it is or not," said Andrew, in a high, querulous voice like a woman's.

"It seems as if it must be somebody's fault.

If it ain't my fault, whose is it?
You can't blame the Almighty." "Maybe it ain't anybody's fault." "It must be.

All that goes wrong is somebody's fault.