FROM THE WELL OF HUMANISM

Here is a quote I recently saw: "Your ability to generate power is directly proportional to your ability to relax." Will someone explain this to me? What is “your power”? It seems to me it could be many things. Your “power” would be directed toward something or things or purpose. What are they? This sentence, “Your ability . . . “, would require many paragraphs to explain it, perhaps a book. The sentence does not convey usable guidance as would a verse (any verse) from Proverbs. The sentence comes from the well of humanism.