It means when you have failed, you must repeat that work or if you have just started it means that you should never give up or quit. You finish whatever you start and aim to be the best.
Practice daily means that you must always repeat by reading your notes and books. Be attentive to details and always do work more than the number you have failed. That way, you learn from your experience and things go into your permanent memory.
Thank you and just remember that your mind is your greatest weapon.
Use it well.