What's the meaning of the word perennial in the excerpt below? "And it chanced that the direction of my scientific studies, which led wholly toward the mystic and the transcendental, re-acted and shed a strong light on this consciousness of the perennial war among my members."

Read this passage from the online article “top 10 reasons why everyone is doing yoga” by kathryn livingston. what type of propaganda is the author using? why are so many people doing yoga these days? there must be more to it than endorphins; there has to be a deeper reason why 20 million plus americans have fallen in love with this venerable practice. here is my top ten list – and if you’re a yogi, i’m sure you can think of more.