Huh, never seen this before. Looks interesting.
https://www.washingtonpost.com/entertainment/books/where-did-steve-bannon-get-his-worldview-from-my-book/2017/02/24/16937f38-f84a-11e6-9845-576c69081518_story.html When you get into it it's... pretty hand-wavey. But it's an interesting view of history. I sure as fuck wouldn't live by it, any more than I'd be looking forward to a white bull born in Israel or whatever. but Steve Bannon (and therefore Donald Trump) are playing the cards as if not only is a war bigger than WWII inevitable, but the sooner we get it over with the sooner we can return to prosperity.
Hard times create strong men, Strong men create good times, Good times create weak men, Weak men create hard times. Still trying to find the real source of the poem this was pulled from. I originally saw this on the wall of the rental booth at a gun range when I moved to Kentucky a decade and a half ago. So it is probably older than that. I've seen people link it to the Stoics, but it probably takes inspiration from multiple sources. Reading that Wiki page I got momentarily excited that you pointed me at the source. Close enough though.
Strauss and Howe based their cycle on the Saeculum, the interval of time coined by the Etruscans to describe the length of a human lifetime. The Romans adopted it but decided that 110 years was the magic number, rather than 80. The Stoics definitely picked stuff up from the Etruscans.
110 is not a magic number if you consider it three generations, each one being just shy of 30 years. Wealth never survives three generations is a saying that has been around since ancient china. Same thing with companies. The Founder generation pours their life into building the business. Then they retire and round two enters to take over; they remember the tough times and the bad stretches and have a loyalty to the founder's vision/name/legacy. Then the third group comes in and all they have every know is MegaCorp and don't give a shit. Ayn Rand talked about these people as the "looter generation" but she used another term for them. The Etruscans were interesting people. I need to get back to reading about them and their influence. Origen wrote on them back when I hated reading about the minutiae of Church history. When I went back with a secular mindset I was able to appreciate these guys much more than before.