What do you think of this quote? Thoughts?
It depends on why they feel bad. If it's their own actions that result in them feeling bad, your quote is true. However, if it's something they can't control, like a chronic medical condition, the quote is blaming the victim and is false.
A command can be neither true nor false. But if you find that using your feeling of 'feeling bad' can make you improve your life, then obviously the theory works for you.
Interesting, but 'feeling bad' is very demotivating. I'm not sure how you could use that feeling to your advantage. However, it's always good to read the ideas of a thinker, which you clearly are!