Perseverance does not always mean sticking to the same thing forever. It means giving full concentration and effort to whatever you are doing right now.
The price of success is to bear the criticism of envy.
The most important opinion you'll ever have is the one you hold of yourself.
Stop stewing and start doing!
The world is a mirror and reflects back your expectations. What you get is what you see.
Stop rationalizing, stop stewing. Get up out of your chair and start doing.