Why are Augustine’s teachings (especially) relevant today?

Augustine’s doctrine of Original Sin, as related to success, failure and politics is explained (that is, at least, provocatively exposed) in just six minutes.

http://aleteia.org/2016/08/07/why-are-augustines-teachings-especially-relevant-today

"...It may sound bleak, but it makes Augustine's philosophy extremely generous towards failure, poverty and defeat - our own, and that of others. It's not for humans to judge each other by outward markers of success. From this analysis flows a lack of moralism and snobbery.

It's our duty to be skeptical about power, and generous towards failure. We don't need to be Christians to be comforted by both these points. They are the religion's universal gifts to political philosophy and human psychology. They stand as permanent reminders of some of the dangers and cruelties of believing that life can be made perfect, or that poverty and obscurity are reliable indicators of vice in a city of men."