Two doomsday forecasts

One contemporary, and one from the 18th century.

Dr. Marc Faber:

"Of all the questions I have about the future, this is the easiest one to answer. Once a society becomes successful it becomes arrogant, righteous, overconfident, corrupt, and decadent ... overspends ... costly wars ... wealth inequity and social tensions increase; and society enters a secular decline." Success makes us our own worst enemy.

18th century Scottish historian Alexander Fraser Tytler:

"The average life span of the world's greatest civilizations has been 200 years" progressing from "bondage to spiritual faith ... to great courage ... to liberty ... to abundance ... to selfishness ... to complacency ... to apathy ... to dependence and ... back into bondage!"