So are the Principles a cure for mental illness? Are the Principles a way to get inspired? Are the Principles a mantra towards a nicer life? Although many people find that learning about the 3 Principles has afforded them all of the above, the Principles themselves are none of those things.
The essence of the Principles are not fully knowable by anyone due to, among other qualities, their infinite nature. There is however, a truth that we are gifted to comprehend and that is the understanding that the feeling I'm experiencing, right now, is created through this singular system. There is no other system that could possibly create my feeling.
Sure, this insight might imply that you could feel differently the instant you think differently, and sure, this insight implies that nobody is inherently broken, but the real power lies in awakening to the clarity that the entirety of our personal reality, including our urges, feelings, drives, opinions, facts, history, satisfaction or disappointment and especially our urgent desire to have a quieter mind or better feeling, is always being generated from within.