NEED HELP ON FINDING QUOTES

Easy work! I need help on finding quotes. I need 4 quotes, they can be a movie, an article from newspapers or magazines, a speech or a journal. The first quote is Know the limitation of your best, no more and no less than your best. The second is about your best can be changed by your personal condition and the increasing of your experiences. The third one is take actions and don’t expect a reward. The last one is keep doing your best and just do your best in any circumstances. Please noted don’t quote from The Four Agreements, and use MLA to do the word cited.