Who said "The soul grows through challenge, not comfort."?

This quote is attributed to Oswald Spengler.

The soul grows through challenge, not comfort. - Oswald Spengler

"The soul grows through challenge, not comfort."

Oswald Spengler Perseverance

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."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."