Who said "Every culture has the seeds of its own decline within it."?

This quote is attributed to Oswald Spengler.

Every culture has the seeds of its own decline within it. - Oswald Spengler

"Every culture has the seeds of its own decline within it."

Oswald Spengler History

Historian Philosopher German 1880–1936

"The West does not move towards its end, but it has already ended."

"Money is congealed labor."

"All profound disturbances of peace are the end of something."

"The history of a culture is the history of its ideas."

"I've seen a lot of things in my time."

"That's how we archaeologists tell time."

"We must learn from history or be doomed to repeat it."

"Every artifact tells a story."