Who said "The war against boredom is the only war worth waging."?

This quote is attributed to Mark Twain.

The war against boredom is the only war worth waging. - Mark Twain

"The war against boredom is the only war worth waging."

Mark Twain Adventure

Novelist American 1835–1910

"The secret of getting ahead is getting started."

"If you tell the truth, you don't have to remember anything."

"The man who does not read has no advantage over the man who cannot read."

"Kindness is the language which the deaf can hear and the blind can see."

"The greatest adventure is life itself."

"The adventure of life begins with a single step."

"Adventure finds you when you stop running."

"Fortune and glory, kid."