Ja nie jestem, mnie nie ma, ja dopiero będę.
Quoted by Wit Szostak
You can't have a better tomorrow if you're thinking about yesterday.
Quoted by Charles Kettering
You can have a better tomorrow if you don't stop thinking about yesterday
Quoted by Ain Eineziz
You can't have a better tomorrow if you are thinking about yesterday all the time.
Quoted by Charles Kettering
Challenge yourself today, to improve, for a better tomorrow than yesterday.
Quoted by Vikrmn