This quote belongs to Maya Angelou (born Marguerite Annie Johnson; 1928 - 2014).
Thomas Edison gave the world the electric light bulb. But we do not realise the number of failures that he experienced before he realised his major invention. Success stories of these inventions overshadow the challenges the individual encountered in the process. You do not often read about the countless failed attempts.
Another excellent example of determination is the child learning to walk for the first time. She/he falls many times in the process, cries, and then seeks comfort from parents, but the child gets back on his feet and tries again until the goal is achieved. This is life! We can learn from both examples to change our lives. Never give up!