Positive, inspirational quotes often involve themes such as overcoming self doubt, valuing what matters and staying positive. For example, Wayne Gretzky said, "You miss 100 percent of the shots you don’t take," notes Forbes, and Henry Ford said, "Whether you think you can or you think you can’t, you’re right."
Other quotes involve letting go of the past. For example, a Chinese Proverb states, "The best time to plant a tree was 20 years ago. The second best time is now." Henry David Thoreau urged, "Go confidently in the direction of your dreams. Live the life you have imagined." Similarly, Helen Keller reflected that people often have trouble moving on after a failure. She said, "When one door of happiness closes, another opens, but often we look so long at the closed door that we do not see the one that has been opened for us."
Mark Twain encouraged people to move past guilt and have courage when he stated, "Twenty years from now you will be more disappointed by the things that you didn’t do than by the ones you did do, so throw off the bowlines, sail away from safe harbor, catch the trade winds in your sails. Explore, Dream, Discover."