There are many variations on this theme, and the message is all the same - it's better to try and fail than to not try at all. And to expand on it further, growth and learning comes from the the struggle and often coming up short. I was about to walk out onto the mat for my first BJJ comp and told my trainer I was nervous about letting him down. He paraphrased the Roosevelt quote above with 'any person who steps into the arena isn't letting me down'.

Another, what I would also consider a variation of the above, is the quote from Michael Jordan, "I've missed more than 9000 shots in my career. I've lost almost 300 games. 26 times, I've been trusted to take the game winning shot and missed. I've failed over and over and over again in my life. And that is why I succeed."